-112=-7(7-3b)

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Solution for -112=-7(7-3b) equation: 



-112=-7(7-3b)

We move all terms to the left:

-112-(-7(7-3b))=0

We add all the numbers together, and all the variables

-(-7(-3b+7))-112=0



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

-7(-3b+7)

We multiply parentheses

21b-49

Back to the equation:

-(21b-49)



We get rid of parentheses

-21b+49-112=0

We add all the numbers together, and all the variables

-21b-63=0

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

-21b=63

b=63/-21

b=-3

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