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