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7=b/2-4
We move all terms to the left:
7-(b/2-4)=0
We get rid of parentheses
-b/2+4+7=0
We multiply all the terms by the denominator
-b+4*2+7*2=0
We add all the numbers together, and all the variables
-1b+22=0
We move all terms containing b to the left, all other terms to the right
-b=-22
b=-22/-1
b=+22
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