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x+3x-x=2x+1
We move all terms to the left:
x+3x-x-(2x+1)=0
We add all the numbers together, and all the variables
3x-(2x+1)=0
We get rid of parentheses
3x-2x-1=0
We add all the numbers together, and all the variables
x-1=0
We move all terms containing x to the left, all other terms to the right
x=1
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