2b-b-b+3b=15

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Solution for 2b-b-b+3b=15 equation: 



2b-b-b+3b=15

We move all terms to the left:

2b-b-b+3b-(15)=0

We add all the numbers together, and all the variables

3b-15=0

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

3b=15

b=15/3

b=5

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