r-2(7r-7)=-90

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Solution for r-2(7r-7)=-90 equation: 



r-2(7r-7)=-90

We move all terms to the left:

r-2(7r-7)-(-90)=0

We add all the numbers together, and all the variables

r-2(7r-7)+90=0

We multiply parentheses

r-14r+14+90=0

We add all the numbers together, and all the variables

-13r+104=0

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

-13r=-104

r=-104/-13

r=+8

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