21=r/3+3

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Solution for 21=r/3+3 equation:


21=r/3+3

We simplify the equation to the form, which is simple to understand 
21=r/3+3

Simplifying:
21=0.333333333333r+3

We move all terms containing r to the left and all other terms to the right. 
-0.333333333333r=+3-21

We simplify left and right side of the equation. 
-0.333333333333r=-18

We divide both sides of the equation by -00.333333333333 to get r. 
r=54.0000000001

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