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x-20=2x+4
We move all terms to the left:
x-20-(2x+4)=0
We get rid of parentheses
x-2x-4-20=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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