15=18+b

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Solution for 15=18+b equation: 



15=18+b

We move all terms to the left:

15-(18+b)=0

We add all the numbers together, and all the variables

-(b+18)+15=0

We get rid of parentheses

-b-18+15=0

We add all the numbers together, and all the variables

-1b-3=0

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

-b=3

b=3/-1

b=-3

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