-20=-4(r+7)

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Solution for -20=-4(r+7) equation: 



-20=-4(r+7)

We move all terms to the left:

-20-(-4(r+7))=0



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

-4(r+7)

We multiply parentheses

-4r-28

Back to the equation:

-(-4r-28)



We get rid of parentheses

4r+28-20=0

We add all the numbers together, and all the variables

4r+8=0

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

4r=-8

r=-8/4

r=-2

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