-5(-6-7b)-5b=-90

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Solution for -5(-6-7b)-5b=-90 equation: 



-5(-6-7b)-5b=-90

We move all terms to the left:

-5(-6-7b)-5b-(-90)=0

We add all the numbers together, and all the variables

-5(-7b-6)-5b-(-90)=0

We add all the numbers together, and all the variables

-5b-5(-7b-6)+90=0

We multiply parentheses

-5b+35b+30+90=0

We add all the numbers together, and all the variables

30b+120=0

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

30b=-120

b=-120/30

b=-4

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