\"\"

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The equation is \"\".

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Apply distributive property: \"\".

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\"\"

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Apply distributive property: \"\".

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\"\"

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\"\"                    (Multiply: \"\") \"\"

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Apply subtraction property of equality: If a = b then \"\".

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\"\"   (Subtract 40 from each side)

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\"\"             (Apply additive inverse property: \"\")

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\"\"                   (Apply additive identity property: \"\")

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\"\"                         (Subtract: \"\")\"\"

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\"\"        (Subtract 3d from each side)

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Apply commutative property of addition: \"\".

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\"\"

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\"\"               (Apply additive inverse property: \"\")

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\"\"                     (Apply additive identity property: \"\")

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\"\"                             (Subtract: \"\")\"\"

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Apply division property of equality: If a = b then \"\"

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\"\"                        (Divide each side by 2)

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\"\"                             (Cancel common terms)

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\"\"                               (Divide: \"\")

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\"\"

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\"\"

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Check:

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To substitute \"\" in \"\".

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\"\"   (Substitute \"\")

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\"\"         (Subtract: \"\")

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\"\"               (Add: \"\")

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\"\"                          (Multiply: \"\")

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The equality is true \"\"

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The solution is \"\".