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3x+31=9x+23=
We move all terms to the left:
3x+31-(9x+23)=0
We get rid of parentheses
3x-9x-23+31=0
We add all the numbers together, and all the variables
-6x+8=0
We move all terms containing x to the left, all other terms to the right
-6x=-8
x=-8/-6
x=1+1/3
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