7(-2-4b)=-7(3b-8)

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Solution for 7(-2-4b)=-7(3b-8) equation: 



7(-2-4b)=-7(3b-8)

We move all terms to the left:

7(-2-4b)-(-7(3b-8))=0

We add all the numbers together, and all the variables

7(-4b-2)-(-7(3b-8))=0

We multiply parentheses

-28b-(-7(3b-8))-14=0



We calculate terms in parentheses: -(-7(3b-8)), so:

-7(3b-8)

We multiply parentheses

-21b+56

Back to the equation:

-(-21b+56)



We get rid of parentheses

-28b+21b-56-14=0

We add all the numbers together, and all the variables

-7b-70=0

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

-7b=70

b=70/-7

b=-10

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