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3x+4x+4+x+x+2=31
We move all terms to the left:
3x+4x+4+x+x+2-(31)=0
We add all the numbers together, and all the variables
9x-25=0
We move all terms containing x to the left, all other terms to the right
9x=25
x=25/9
x=2+7/9
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