$\"\"$

The inequality is $\"\"$ .

Apply subtraction property of inequality: Subtract 18 from each side.

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

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

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

Check:

To check, substitute $\"\"$ 20, a number greater than $\"\"$ 20 in $\"\"$ .

$\"\"$

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

The inequality solution set is $\"\"$ .