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