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D( x )
2*x-4 = 0
3*x-6 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in (-oo:2) U (2:+oo)
2/(2*x-4) = 3/(3*x-6) // - 3/(3*x-6)
2/(2*x-4)-(3/(3*x-6)) = 0
2/(2*x-4)-3*(3*x-6)^-1 = 0
2/(2*x-4)-3/(3*x-6) = 0
(2*(3*x-6))/((2*x-4)*(3*x-6))+(-3*(2*x-4))/((2*x-4)*(3*x-6)) = 0
2*(3*x-6)-3*(2*x-4) = 0
0 = 0
0/((2*x-4)*(3*x-6)) = 0
0/((2*x-4)*(3*x-6)) = 0 // * (2*x-4)*(3*x-6)
0 = 0
x belongs to the empty set
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