-8(r+7)-r=-4r-21

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Solution for -8(r+7)-r=-4r-21 equation: 



-8(r+7)-r=-4r-21

We move all terms to the left:

-8(r+7)-r-(-4r-21)=0

We add all the numbers together, and all the variables

-1r-8(r+7)-(-4r-21)=0

We multiply parentheses

-1r-8r-(-4r-21)-56=0

We get rid of parentheses

-1r-8r+4r+21-56=0

We add all the numbers together, and all the variables

-5r-35=0

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

-5r=35

r=35/-5

r=-7

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