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12=4+x/2
We move all terms to the left:
12-(4+x/2)=0
We add all the numbers together, and all the variables
-(x/2+4)+12=0
We get rid of parentheses
-x/2-4+12=0
We multiply all the terms by the denominator
-x-4*2+12*2=0
We add all the numbers together, and all the variables
-1x+16=0
We move all terms containing x to the left, all other terms to the right
-x=-16
x=-16/-1
x=+16
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