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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-7(-4r-8)), so:

-7(-4r-8)

We multiply parentheses

28r+56

Back to the equation:

-(28r+56)



We get rid of parentheses

-7r-28r-56+21=0

We add all the numbers together, and all the variables

-35r-35=0

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

-35r=35

r=35/-35

r=-1

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