Rewrite so <math><mstyle displaystyle="true"><mi>r</mi></mstyle></math> is on the left side of the inequality.

Divide each term in <math><mstyle displaystyle="true"><mn>3</mn><mi>r</mi><mo>></mo><mn>15</mn></mstyle></math> by <math><mstyle displaystyle="true"><mn>3</mn></mstyle></math> .

Simplify the left side.

Cancel the common factor of <math><mstyle displaystyle="true"><mn>3</mn></mstyle></math> .

Cancel the common factor.

Divide <math><mstyle displaystyle="true"><mi>r</mi></mstyle></math> by <math><mstyle displaystyle="true"><mn>1</mn></mstyle></math> .

Simplify the right side.

Divide <math><mstyle displaystyle="true"><mn>15</mn></mstyle></math> by <math><mstyle displaystyle="true"><mn>3</mn></mstyle></math> .

The result can be shown in multiple forms.

Inequality Form:

Interval Notation:

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