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x+x+x-3+x-3=x+1+x+1+x+1
We move all terms to the left:
x+x+x-3+x-3-(x+1+x+1+x+1)=0
We add all the numbers together, and all the variables
x+x+x+x-(3x+3)-3-3=0
We add all the numbers together, and all the variables
4x-(3x+3)-6=0
We get rid of parentheses
4x-3x-3-6=0
We add all the numbers together, and all the variables
x-9=0
We move all terms containing x to the left, all other terms to the right
x=9
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