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2+15=-8B
We move all terms to the left:
2+15-(-8B)=0
We add all the numbers together, and all the variables
-(-8B)+17=0
We get rid of parentheses
8B+17=0
We move all terms containing B to the left, all other terms to the right
8B=-17
B=-17/8
B=-2+1/8
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