-70=-3(-3-b)-4(7+5b)

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Solution for -70=-3(-3-b)-4(7+5b) equation: 



-70=-3(-3-b)-4(7+5b)

We move all terms to the left:

-70-(-3(-3-b)-4(7+5b))=0

We add all the numbers together, and all the variables

-(-3(-1b-3)-4(5b+7))-70=0



We calculate terms in parentheses: -(-3(-1b-3)-4(5b+7)), so:

-3(-1b-3)-4(5b+7)

We multiply parentheses

3b-20b+9-28

We add all the numbers together, and all the variables

-17b-19

Back to the equation:

-(-17b-19)



We get rid of parentheses

17b+19-70=0

We add all the numbers together, and all the variables

17b-51=0

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

17b=51

b=51/17

b=3

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