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