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-20=x/3-12
We move all terms to the left:
-20-(x/3-12)=0
We get rid of parentheses
-x/3+12-20=0
We multiply all the terms by the denominator
-x+12*3-20*3=0
We add all the numbers together, and all the variables
-1x-24=0
We move all terms containing x to the left, all other terms to the right
-x=24
x=24/-1
x=-24
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