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(7-B)=27
We move all terms to the left:
(7-B)-(27)=0
We add all the numbers together, and all the variables
(-1B+7)-27=0
We get rid of parentheses
-1B+7-27=0
We add all the numbers together, and all the variables
-1B-20=0
We move all terms containing B to the left, all other terms to the right
-B=20
B=20/-1
B=-20
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