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-x/2=57
We move all terms to the left:
-x/2-(57)=0
We multiply all the terms by the denominator
-x-57*2=0
We add all the numbers together, and all the variables
-1x-114=0
We move all terms containing x to the left, all other terms to the right
-x=114
x=114/-1
x=-114
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