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-12=2+5B+2B
We move all terms to the left:
-12-(2+5B+2B)=0
We add all the numbers together, and all the variables
-(7B+2)-12=0
We get rid of parentheses
-7B-2-12=0
We add all the numbers together, and all the variables
-7B-14=0
We move all terms containing B to the left, all other terms to the right
-7B=14
B=14/-7
B=-2
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