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12+2b=4b+3
We move all terms to the left:
12+2b-(4b+3)=0
We get rid of parentheses
2b-4b-3+12=0
We add all the numbers together, and all the variables
-2b+9=0
We move all terms containing b to the left, all other terms to the right
-2b=-9
b=-9/-2
b=4+1/2
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