90=-5(r-4)-5r

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Solution for 90=-5(r-4)-5r equation: 



90=-5(r-4)-5r

We move all terms to the left:

90-(-5(r-4)-5r)=0



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

-5(r-4)-5r

We add all the numbers together, and all the variables

-5r-5(r-4)

We multiply parentheses

-5r-5r+20

We add all the numbers together, and all the variables

-10r+20

Back to the equation:

-(-10r+20)



We get rid of parentheses

10r-20+90=0

We add all the numbers together, and all the variables

10r+70=0

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

10r=-70

r=-70/10

r=-7

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