-3(5+7b)-2b=100

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Solution for -3(5+7b)-2b=100 equation: 



-3(5+7b)-2b=100

We move all terms to the left:

-3(5+7b)-2b-(100)=0

We add all the numbers together, and all the variables

-3(7b+5)-2b-100=0

We add all the numbers together, and all the variables

-2b-3(7b+5)-100=0

We multiply parentheses

-2b-21b-15-100=0

We add all the numbers together, and all the variables

-23b-115=0

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

-23b=115

b=115/-23

b=-5

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