90=5r-5(2-3r)

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Solution for 90=5r-5(2-3r) equation: 



90=5r-5(2-3r)

We move all terms to the left:

90-(5r-5(2-3r))=0

We add all the numbers together, and all the variables

-(5r-5(-3r+2))+90=0



We calculate terms in parentheses: -(5r-5(-3r+2)), so:

5r-5(-3r+2)

We multiply parentheses

5r+15r-10

We add all the numbers together, and all the variables

20r-10

Back to the equation:

-(20r-10)



We get rid of parentheses

-20r+10+90=0

We add all the numbers together, and all the variables

-20r+100=0

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

-20r=-100

r=-100/-20

r=+5

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