3(r-5)=21

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Solution for 3(r-5)=21 equation:


3(r-5)=21

We simplify the equation to the form, which is simple to understand 
3(r-5)=21

Reorder the terms in parentheses
+(+3r-15)=21

Remove unnecessary parentheses
+3r-15=+21

We move all terms containing r to the left and all other terms to the right. 
+3r=+21+15

We simplify left and right side of the equation. 
+3r=+36

We divide both sides of the equation by 3 to get r. 
r=12

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