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