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2=8B+12-7B
We move all terms to the left:
2-(8B+12-7B)=0
We add all the numbers together, and all the variables
-(B+12)+2=0
We get rid of parentheses
-B-12+2=0
We add all the numbers together, and all the variables
-1B-10=0
We move all terms containing B to the left, all other terms to the right
-B=10
B=10/-1
B=-10
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