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