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+8=2B+12
We move all terms to the left:
+8-(2B+12)=0
We get rid of parentheses
-2B-12+8=0
We add all the numbers together, and all the variables
-2B-4=0
We move all terms containing B to the left, all other terms to the right
-2B=4
B=4/-2
B=-2
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