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-12+1+7b+7=8+8b-4b
We move all terms to the left:
-12+1+7b+7-(8+8b-4b)=0
We add all the numbers together, and all the variables
7b-(4b+8)-12+1+7=0
We add all the numbers together, and all the variables
7b-(4b+8)-4=0
We get rid of parentheses
7b-4b-8-4=0
We add all the numbers together, and all the variables
3b-12=0
We move all terms containing b to the left, all other terms to the right
3b=12
b=12/3
b=4
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