Pre-Algebra Examples

$9 < x + 7 < 16$

Subtract $7$ from each section of the inequality because it does not contain the variable we are trying to solve for.

$9 - 7 < x < 16 - 7$

Subtract $7$ from $9$ .

$2 < x < 16 - 7$

Subtract $7$ from $16$ .

$2 < x < 9$

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$