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x in (-oo:+oo)
(x-3)/3+1 = (2*x+1)/6-2 // - (2*x+1)/6-2
(x-3)/3-((2*x+1)/6)+1+2 = 0
(x-3)/3+(-1*(2*x+1))/6+1+2 = 0
(6*(x-3))/(3*6)+(-1*3*(2*x+1))/(3*6)+(1*3*6)/(3*6)+(2*3*6)/(3*6) = 0
6*(x-3)-1*3*(2*x+1)+1*3*6+2*3*6 = 0
18-21+36 = 0
36-3 = 0
33 = 0
33/(3*6) = 0
33/(3*6) = 0 // * 3*6
33 = 0
x belongs to the empty set
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