-180=-5(8+4r)

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Solution for -180=-5(8+4r) equation: 



-180=-5(8+4r)

We move all terms to the left:

-180-(-5(8+4r))=0

We add all the numbers together, and all the variables

-(-5(4r+8))-180=0



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

-5(4r+8)

We multiply parentheses

-20r-40

Back to the equation:

-(-20r-40)



We get rid of parentheses

20r+40-180=0

We add all the numbers together, and all the variables

20r-140=0

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

20r=140

r=140/20

r=7

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