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4x+20=x+3x+20
We move all terms to the left:
4x+20-(x+3x+20)=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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