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4x-20=2x-20+2x
We move all terms to the left:
4x-20-(2x-20+2x)=0
We add all the numbers together, and all the variables
4x-(4x-20)-20=0
We get rid of parentheses
4x-4x+20-20=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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