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=4-B
We move all terms to the left:
-(4-B)=0
We add all the numbers together, and all the variables
-(-1B+4)=0
We get rid of parentheses
1B-4=0
We add all the numbers together, and all the variables
B-4=0
We move all terms containing B to the left, all other terms to the right
B=4
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