90=-4(4r-5)+6r

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Solution for 90=-4(4r-5)+6r equation: 



90=-4(4r-5)+6r

We move all terms to the left:

90-(-4(4r-5)+6r)=0



We calculate terms in parentheses: -(-4(4r-5)+6r), so:

-4(4r-5)+6r

We add all the numbers together, and all the variables

6r-4(4r-5)

We multiply parentheses

6r-16r+20

We add all the numbers together, and all the variables

-10r+20

Back to the equation:

-(-10r+20)



We get rid of parentheses

10r-20+90=0

We add all the numbers together, and all the variables

10r+70=0

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

10r=-70

r=-70/10

r=-7

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