-8(-b-4)=-40

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Solution for -8(-b-4)=-40 equation: 



-8(-b-4)=-40

We move all terms to the left:

-8(-b-4)-(-40)=0

We add all the numbers together, and all the variables

-8(-1b-4)-(-40)=0

We add all the numbers together, and all the variables

-8(-1b-4)+40=0

We multiply parentheses

8b+32+40=0

We add all the numbers together, and all the variables

8b+72=0

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

8b=-72

b=-72/8

b=-9

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