-90=-10(11+r)

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Solution for -90=-10(11+r) equation: 



-90=-10(11+r)

We move all terms to the left:

-90-(-10(11+r))=0

We add all the numbers together, and all the variables

-(-10(r+11))-90=0



We calculate terms in parentheses: -(-10(r+11)), so:

-10(r+11)

We multiply parentheses

-10r-110

Back to the equation:

-(-10r-110)



We get rid of parentheses

10r+110-90=0

We add all the numbers together, and all the variables

10r+20=0

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

10r=-20

r=-20/10

r=-2

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