-90=9(8-9m)

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Solution for -90=9(8-9m) equation: 



-90=9(8-9m)

We move all terms to the left:

-90-(9(8-9m))=0

We add all the numbers together, and all the variables

-(9(-9m+8))-90=0



We calculate terms in parentheses: -(9(-9m+8)), so:

9(-9m+8)

We multiply parentheses

-81m+72

Back to the equation:

-(-81m+72)



We get rid of parentheses

81m-72-90=0

We add all the numbers together, and all the variables

81m-162=0

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

81m=162

m=162/81

m=2

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