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7x-2+4x+31+9x-31=110
We move all terms to the left:
7x-2+4x+31+9x-31-(110)=0
We add all the numbers together, and all the variables
20x-112=0
We move all terms containing x to the left, all other terms to the right
20x=112
x=112/20
x=5+3/5
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