31=b-40

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Solution for 31=b-40 equation: 



31=b-40

We move all terms to the left:

31-(b-40)=0

We get rid of parentheses

-b+40+31=0

We add all the numbers together, and all the variables

-1b+71=0

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

-b=-71

b=-71/-1

b=+71

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