21=60-6r

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Solution for 21=60-6r equation: 



21=60-6r

We move all terms to the left:

21-(60-6r)=0

We add all the numbers together, and all the variables

-(-6r+60)+21=0

We get rid of parentheses

6r-60+21=0

We add all the numbers together, and all the variables

6r-39=0

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

6r=39

r=39/6

r=6+1/2

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