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12=b/2+2
We move all terms to the left:
12-(b/2+2)=0
We get rid of parentheses
-b/2-2+12=0
We multiply all the terms by the denominator
-b-2*2+12*2=0
We add all the numbers together, and all the variables
-1b+20=0
We move all terms containing b to the left, all other terms to the right
-b=-20
b=-20/-1
b=+20
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