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

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The equation is $\"\"$

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According to Addition Property of equality: If $\"\"$ then, $\"\"$ .

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$\"\"$ (Add 4n to each side)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity proparty: $\"\"$

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$\"\"$ (Distributive property: $\"\"$ )

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

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According to Subtraction Property of equality: If $\"\"$ then, $\"\"$ .

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$\"\"$ (Subtract 11v from each side)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity proparty: $\"\"$

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$\"\"$ (Divide each side by 31)

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$\"\"$ (Cancel common terms) $\"\"$

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Verify:

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

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$\"\"$

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$\"\"$ (Cancel by the common terms)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity proparty: $\"\"$ )

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Compare the values, the equation is true.

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$\"\"$

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The value of n is $\"\"$ .