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x+x+x+2+3x-6=31
We move all terms to the left:
x+x+x+2+3x-6-(31)=0
We add all the numbers together, and all the variables
6x-35=0
We move all terms containing x to the left, all other terms to the right
6x=35
x=35/6
x=5+5/6
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