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5b-4=7b+12
We move all terms to the left:
5b-4-(7b+12)=0
We get rid of parentheses
5b-7b-12-4=0
We add all the numbers together, and all the variables
-2b-16=0
We move all terms containing b to the left, all other terms to the right
-2b=16
b=16/-2
b=-8
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