13=15+b

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Solution for 13=15+b equation: 



13=15+b

We move all terms to the left:

13-(15+b)=0

We add all the numbers together, and all the variables

-(b+15)+13=0

We get rid of parentheses

-b-15+13=0

We add all the numbers together, and all the variables

-1b-2=0

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

-b=2

b=2/-1

b=-2

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