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-3=6B+7
We move all terms to the left:
-3-(6B+7)=0
We get rid of parentheses
-6B-7-3=0
We add all the numbers together, and all the variables
-6B-10=0
We move all terms containing B to the left, all other terms to the right
-6B=10
B=10/-6
B=-1+2/3
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