$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Apply distributive property: a(b + c) = ab + ac) $\"\"$ (Multiply: $\"\"$ )

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

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Apply subtraction property of equality: Subtract 1.5n from each side.

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$\"\"$ $\"\"$ $\"\"$ (Apply Commutative property: a + b = b + a)

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

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$\"\"$ (Apply distributive property: $\"\"$ )

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

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$\"\"$ (Add 3 to each side )

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

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

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$\"\"$ (Add: 3 + 3 = 6)

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$\"\"$

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$\"\"$ (Divide each side by 1.5)

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$\"\"$ (Cancel common terms)

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

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Check:

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To check, substitute n = 4 in $\"\"$ .

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$\"\"$

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

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

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

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The solution of $\"\"$ .