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48=b/2+12
We move all terms to the left:
48-(b/2+12)=0
We get rid of parentheses
-b/2-12+48=0
We multiply all the terms by the denominator
-b-12*2+48*2=0
We add all the numbers together, and all the variables
-1b+72=0
We move all terms containing b to the left, all other terms to the right
-b=-72
b=-72/-1
b=+72
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