Algebra Examples

$13 > 18 + r$

Step 1

Rewrite so $r$ is on the left side of the inequality.

$18 + r < 13$

Step 2

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

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Step 2.1

Subtract $18$ from both sides of the inequality.

$r < 13 - 18$

Step 2.2

Subtract $18$ from $13$ .

$r < - 5$

Step 3

The result can be shown in multiple forms.

Inequality Form:

$r < - 5$

Interval Notation:

$(- \infty, - 5)$