-155=7b-4(7b+2)

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Solution for -155=7b-4(7b+2) equation: 



-155=7b-4(7b+2)

We move all terms to the left:

-155-(7b-4(7b+2))=0



We calculate terms in parentheses: -(7b-4(7b+2)), so:

7b-4(7b+2)

We multiply parentheses

7b-28b-8

We add all the numbers together, and all the variables

-21b-8

Back to the equation:

-(-21b-8)



We get rid of parentheses

21b+8-155=0

We add all the numbers together, and all the variables

21b-147=0

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

21b=147

b=147/21

b=7

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