21=64+5-7r

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Solution for 21=64+5-7r equation: 



21=64+5-7r

We move all terms to the left:

21-(64+5-7r)=0

We add all the numbers together, and all the variables

-(-7r+69)+21=0

We get rid of parentheses

7r-69+21=0

We add all the numbers together, and all the variables

7r-48=0

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

7r=48

r=48/7

r=6+6/7

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