8=40+b

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Solution for 8=40+b equation: 



8=40+b

We move all terms to the left:

8-(40+b)=0

We add all the numbers together, and all the variables

-(b+40)+8=0

We get rid of parentheses

-b-40+8=0

We add all the numbers together, and all the variables

-1b-32=0

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

-b=32

b=32/-1

b=-32

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