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

The inequlaity is $\"\"$ .

Apply addition property of inequality: Add 2.1 to each side.

$\"\"$

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

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

$\"\"$ (Add: 22 + 2.1 = 24.1)

$\"\"$

Check:

To substitute a number less than or equal to 24.1 in $\"\"$ .

$\"\"$ (Substitute c = 23)

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

The inequality is true $\"\"$

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