Precalculus Examples

$x - 9 < - 15$

Step 1

Move all terms not containing $x$ to the right side of the inequality.

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Step 1.1

Add $9$ to both sides of the inequality.

$x < - 15 + 9$

Step 1.2

Add $- 15$ and $9$ .

$x < - 6$

Step 2

Convert the inequality to interval notation.

$(- \infty, - 6)$

Step 3