28=b+13

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Solution for 28=b+13 equation: 



28=b+13

We move all terms to the left:

28-(b+13)=0

We get rid of parentheses

-b-13+28=0

We add all the numbers together, and all the variables

-1b+15=0

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

-b=-15

b=-15/-1

b=+15

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