-64=40-8b

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Solution for -64=40-8b equation: 



-64=40-8b

We move all terms to the left:

-64-(40-8b)=0

We add all the numbers together, and all the variables

-(-8b+40)-64=0

We get rid of parentheses

8b-40-64=0

We add all the numbers together, and all the variables

8b-104=0

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

8b=104

b=104/8

b=13

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