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40x-20=24x-12
We move all terms to the left:
40x-20-(24x-12)=0
We get rid of parentheses
40x-24x+12-20=0
We add all the numbers together, and all the variables
16x-8=0
We move all terms containing x to the left, all other terms to the right
16x=8
x=8/16
x=1/2
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