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12=2b+5
We move all terms to the left:
12-(2b+5)=0
We get rid of parentheses
-2b-5+12=0
We add all the numbers together, and all the variables
-2b+7=0
We move all terms containing b to the left, all other terms to the right
-2b=-7
b=-7/-2
b=3+1/2
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