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-4=8+3B
We move all terms to the left:
-4-(8+3B)=0
We add all the numbers together, and all the variables
-(3B+8)-4=0
We get rid of parentheses
-3B-8-4=0
We add all the numbers together, and all the variables
-3B-12=0
We move all terms containing B to the left, all other terms to the right
-3B=12
B=12/-3
B=-4
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