13=b+31

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Solution for 13=b+31 equation: 



13=b+31

We move all terms to the left:

13-(b+31)=0

We get rid of parentheses

-b-31+13=0

We add all the numbers together, and all the variables

-1b-18=0

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

-b=18

b=18/-1

b=-18

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