$\"\"$

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The inequality is $\"\"$ .

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Apply subtraction property of inequality: Subtract 12 from each side.

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

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

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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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Check:

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To check, substitute $\"\"$ , a number less than or equals to $\"\"$ , in $\"\"$ .

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$\"\"$

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

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The inequality solution is $\"\"$ .