13=b-15

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Solution for 13=b-15 equation: 



13=b-15

We move all terms to the left:

13-(b-15)=0

We get rid of parentheses

-b+15+13=0

We add all the numbers together, and all the variables

-1b+28=0

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

-b=-28

b=-28/-1

b=+28

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