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