21=r/7

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Solution for 21=r/7 equation: 



21=r/7

We move all terms to the left:

21-(r/7)=0

We add all the numbers together, and all the variables

-(+r/7)+21=0

We get rid of parentheses

-r/7+21=0

We multiply all the terms by the denominator


-r+21*7=0

We add all the numbers together, and all the variables

-1r+147=0

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

-r=-147

r=-147/-1

r=+147

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