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8b+12=6b-40
We move all terms to the left:
8b+12-(6b-40)=0
We get rid of parentheses
8b-6b+40+12=0
We add all the numbers together, and all the variables
2b+52=0
We move all terms containing b to the left, all other terms to the right
2b=-52
b=-52/2
b=-26
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