-21=3+7r+5r

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Solution for -21=3+7r+5r equation: 



-21=3+7r+5r

We move all terms to the left:

-21-(3+7r+5r)=0

We add all the numbers together, and all the variables

-(12r+3)-21=0

We get rid of parentheses

-12r-3-21=0

We add all the numbers together, and all the variables

-12r-24=0

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

-12r=24

r=24/-12

r=-2

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