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x in (-oo:+oo)
x+2/3 = (5*x-1)/5-6 // - (5*x-1)/5-6
x-((5*x-1)/5)+2/3+6 = 0
(-1*(5*x-1))/5+x+2/3+6 = 0
(-1*3*(5*x-1))/(3*5)+(3*5*x)/(3*5)+(2*5)/(3*5)+(3*5*6)/(3*5) = 0
3*5*x-1*3*(5*x-1)+2*5+3*5*6 = 0
3+10+90 = 0
13+90 = 0
103 = 0
103/(3*5) = 0
103/(3*5) = 0 // * 3*5
103 = 0
x belongs to the empty set
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