-90=2(-5r-5)

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Solution for -90=2(-5r-5) equation: 



-90=2(-5r-5)

We move all terms to the left:

-90-(2(-5r-5))=0



We calculate terms in parentheses: -(2(-5r-5)), so:

2(-5r-5)

We multiply parentheses

-10r-10

Back to the equation:

-(-10r-10)



We get rid of parentheses

10r+10-90=0

We add all the numbers together, and all the variables

10r-80=0

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

10r=80

r=80/10

r=8

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