-81=-4b-5b

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Solution for -81=-4b-5b equation: 



-81=-4b-5b

We move all terms to the left:

-81-(-4b-5b)=0

We add all the numbers together, and all the variables

-(-9b)-81=0

We get rid of parentheses

9b-81=0

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

9b=81

b=81/9

b=9

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