172=-3(-7b-2)-2

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Solution for 172=-3(-7b-2)-2 equation: 



172=-3(-7b-2)-2

We move all terms to the left:

172-(-3(-7b-2)-2)=0



We calculate terms in parentheses: -(-3(-7b-2)-2), so:

-3(-7b-2)-2

We multiply parentheses

21b+6-2

We add all the numbers together, and all the variables

21b+4

Back to the equation:

-(21b+4)



We get rid of parentheses

-21b-4+172=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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