$\"\"$ $\"\"$ $\"\"$

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The equation is $\"\"$

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According to subtraction property of equality:Subtract 5c from each side.

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$\"\"$

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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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 5 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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$\"\"$

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According to subtraction property of equality: Divide each side by 15.

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$\"\"$

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$\"\"$ (Cancel common terms)

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

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$\"\"$

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Check:

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To verify the solution, substitute $\"\"$ in original equation.

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ and $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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The equation is true.

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$\"\"$

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The value of $\"\"$ .