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39=x/2
We move all terms to the left:
39-(x/2)=0
We add all the numbers together, and all the variables
-(+x/2)+39=0
We get rid of parentheses
-x/2+39=0
We multiply all the terms by the denominator
-x+39*2=0
We add all the numbers together, and all the variables
-1x+78=0
We move all terms containing x to the left, all other terms to the right
-x=-78
x=-78/-1
x=+78
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