-3+2b=15

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Solution for -3+2b=15 equation: 



-3+2b=15

We move all terms to the left:

-3+2b-(15)=0

We add all the numbers together, and all the variables

2b-18=0

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

2b=18

b=18/2

b=9

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