-40=-2(1-b)-7(b+4)

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Solution for -40=-2(1-b)-7(b+4) equation: 



-40=-2(1-b)-7(b+4)

We move all terms to the left:

-40-(-2(1-b)-7(b+4))=0

We add all the numbers together, and all the variables

-(-2(-1b+1)-7(b+4))-40=0



We calculate terms in parentheses: -(-2(-1b+1)-7(b+4)), so:

-2(-1b+1)-7(b+4)

We multiply parentheses

2b-7b-2-28

We add all the numbers together, and all the variables

-5b-30

Back to the equation:

-(-5b-30)



We get rid of parentheses

5b+30-40=0

We add all the numbers together, and all the variables

5b-10=0

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

5b=10

b=10/5

b=2

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