90=-6(r-6)-3r

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Solution for 90=-6(r-6)-3r equation: 



90=-6(r-6)-3r

We move all terms to the left:

90-(-6(r-6)-3r)=0



We calculate terms in parentheses: -(-6(r-6)-3r), so:

-6(r-6)-3r

We add all the numbers together, and all the variables

-3r-6(r-6)

We multiply parentheses

-3r-6r+36

We add all the numbers together, and all the variables

-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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