21=6(r-3)-13

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Solution for 21=6(r-3)-13 equation:


21=6(r-3)-13

We simplify the equation to the form, which is simple to understand 
21=6(r-3)-13

Reorder the terms in parentheses
21=+(+6r-18)-13

Remove unnecessary parentheses
+21=+6r-18-13

We move all terms containing r to the left and all other terms to the right. 
-6r=-18-13-21

We simplify left and right side of the equation. 
-6r=-52

We divide both sides of the equation by -06 to get r. 
r=8.6666666666667

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