Pre-Algebra Examples

$4 < x - 9 < 13$

Step 1

Add $9$ to each section of the inequality because it does not contain the variable we are trying to solve for.

$4 + 9 < x < 13 + 9$

Step 2

Add $4$ and $9$ .

$13 < x < 13 + 9$

Step 3

Add $13$ and $9$ .

$13 < x < 22$

Step 4