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20=-2x+4x
We move all terms to the left:
20-(-2x+4x)=0
We add all the numbers together, and all the variables
-(+2x)+20=0
We get rid of parentheses
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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