$\"multiplication$ $\"\"$

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The equation is $\"\"$

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Apply subtraction property of equality: Subtract 15 from each side.

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$\"\"$

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

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

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

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$\"\"$ (Divide each side by 3)

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$\"\"$ (Cancel common terms)

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$\"\"$

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$\"\"$

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Check:

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To check, substitute $\"\"$ in $\"\"$ .

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$\"\"$

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

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

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The equation is true. $\"\"$

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The solution of $\"\"$ .