90=-9(r-4)

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Solution for 90=-9(r-4) equation: 



90=-9(r-4)

We move all terms to the left:

90-(-9(r-4))=0



We calculate terms in parentheses: -(-9(r-4)), so:

-9(r-4)

We multiply parentheses

-9r+36

Back to the equation:

-(-9r+36)



We get rid of parentheses

9r-36+90=0

We add all the numbers together, and all the variables

9r+54=0

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

9r=-54

r=-54/9

r=-6

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