90=-2r+8(3r+3)

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Solution for 90=-2r+8(3r+3) equation: 



90=-2r+8(3r+3)

We move all terms to the left:

90-(-2r+8(3r+3))=0



We calculate terms in parentheses: -(-2r+8(3r+3)), so:

-2r+8(3r+3)

We multiply parentheses

-2r+24r+24

We add all the numbers together, and all the variables

22r+24

Back to the equation:

-(22r+24)



We get rid of parentheses

-22r-24+90=0

We add all the numbers together, and all the variables

-22r+66=0

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

-22r=-66

r=-66/-22

r=+3

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