21=0.35r

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Solution for 21=0.35r equation: 



21=0.35r

We move all terms to the left:

21-(0.35r)=0

We add all the numbers together, and all the variables

-(+0.35r)+21=0

We get rid of parentheses

-0.35r+21=0

We move all terms containing r to the left, all other terms to the right

-0.35r=-21

r=-21/-0.35

r=+60

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