90=-7(r-7)-8

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Solution for 90=-7(r-7)-8 equation: 



90=-7(r-7)-8

We move all terms to the left:

90-(-7(r-7)-8)=0



We calculate terms in parentheses: -(-7(r-7)-8), so:

-7(r-7)-8

We multiply parentheses

-7r+49-8

We add all the numbers together, and all the variables

-7r+41

Back to the equation:

-(-7r+41)



We get rid of parentheses

7r-41+90=0

We add all the numbers together, and all the variables

7r+49=0

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

7r=-49

r=-49/7

r=-7

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