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3x+3x+2x-6+2x-6=68
We move all terms to the left:
3x+3x+2x-6+2x-6-(68)=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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