9(b-81)=90

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Solution for 9(b-81)=90 equation: 



9(b-81)=90

We move all terms to the left:

9(b-81)-(90)=0

We multiply parentheses

9b-729-90=0

We add all the numbers together, and all the variables

9b-819=0

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

9b=819

b=819/9

b=91

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