-90=-2(7+7r)-6

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Solution for -90=-2(7+7r)-6 equation: 



-90=-2(7+7r)-6

We move all terms to the left:

-90-(-2(7+7r)-6)=0

We add all the numbers together, and all the variables

-(-2(7r+7)-6)-90=0



We calculate terms in parentheses: -(-2(7r+7)-6), so:

-2(7r+7)-6

We multiply parentheses

-14r-14-6

We add all the numbers together, and all the variables

-14r-20

Back to the equation:

-(-14r-20)



We get rid of parentheses

14r+20-90=0

We add all the numbers together, and all the variables

14r-70=0

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

14r=70

r=70/14

r=5

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