31=2b+15

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Solution for 31=2b+15 equation: 



31=2b+15

We move all terms to the left:

31-(2b+15)=0

We get rid of parentheses

-2b-15+31=0

We add all the numbers together, and all the variables

-2b+16=0

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

-2b=-16

b=-16/-2

b=+8

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