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20=x2x-4
We move all terms to the left:
20-(x2x-4)=0
We get rid of parentheses
-x2x+4+20=0
We add all the numbers together, and all the variables
-x2x+24=0
We move all terms containing x to the left, all other terms to the right
-x2x=-24
x=-24/1
x=-24
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