-3(7b-4)=180

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Solution for -3(7b-4)=180 equation: 



-3(7b-4)=180

We move all terms to the left:

-3(7b-4)-(180)=0

We multiply parentheses

-21b+12-180=0

We add all the numbers together, and all the variables

-21b-168=0

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

-21b=168

b=168/-21

b=-8

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