-80=7(4r-8)+4(-5r-4)

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Solution for -80=7(4r-8)+4(-5r-4) equation: 



-80=7(4r-8)+4(-5r-4)

We move all terms to the left:

-80-(7(4r-8)+4(-5r-4))=0



We calculate terms in parentheses: -(7(4r-8)+4(-5r-4)), so:

7(4r-8)+4(-5r-4)

We multiply parentheses

28r-20r-56-16

We add all the numbers together, and all the variables

8r-72

Back to the equation:

-(8r-72)



We get rid of parentheses

-8r+72-80=0

We add all the numbers together, and all the variables

-8r-8=0

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

-8r=8

r=8/-8

r=-1

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