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75=x/2+12
We move all terms to the left:
75-(x/2+12)=0
We get rid of parentheses
-x/2-12+75=0
We multiply all the terms by the denominator
-x-12*2+75*2=0
We add all the numbers together, and all the variables
-1x+126=0
We move all terms containing x to the left, all other terms to the right
-x=-126
x=-126/-1
x=+126
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