15=b+20

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Solution for 15=b+20 equation: 



15=b+20

We move all terms to the left:

15-(b+20)=0

We get rid of parentheses

-b-20+15=0

We add all the numbers together, and all the variables

-1b-5=0

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

-b=5

b=5/-1

b=-5

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