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20=x/12-4
We move all terms to the left:
20-(x/12-4)=0
We get rid of parentheses
-x/12+4+20=0
We multiply all the terms by the denominator
-x+4*12+20*12=0
We add all the numbers together, and all the variables
-1x+288=0
We move all terms containing x to the left, all other terms to the right
-x=-288
x=-288/-1
x=+288
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