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3x+3x+1+3x+2=351
We move all terms to the left:
3x+3x+1+3x+2-(351)=0
We add all the numbers together, and all the variables
9x-348=0
We move all terms containing x to the left, all other terms to the right
9x=348
x=348/9
x=38+2/3
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