15+15+15=b

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Solution for 15+15+15=b equation: 



15+15+15=b

We move all terms to the left:

15+15+15-(b)=0

We add all the numbers together, and all the variables

-1b+45=0

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

-b=-45

b=-45/-1

b=+45

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