-90=7r-8(8r-3)

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Solution for -90=7r-8(8r-3) equation: 



-90=7r-8(8r-3)

We move all terms to the left:

-90-(7r-8(8r-3))=0



We calculate terms in parentheses: -(7r-8(8r-3)), so:

7r-8(8r-3)

We multiply parentheses

7r-64r+24

We add all the numbers together, and all the variables

-57r+24

Back to the equation:

-(-57r+24)



We get rid of parentheses

57r-24-90=0

We add all the numbers together, and all the variables

57r-114=0

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

57r=114

r=114/57

r=2

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