-3(r-7)=21

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Solution for -3(r-7)=21 equation:


-3(r-7)=21

We simplify the equation to the form, which is simple to understand 
-3(r-7)=21

Reorder the terms in parentheses
+(-3r+21)=21

Remove unnecessary parentheses
-3r+21=+21

We move all terms containing r to the left and all other terms to the right. 
-3r=+21-21

We simplify left and right side of the equation. 
-3r=0

We divide both sides of the equation by -3 to get r. 
r=-0

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