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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(6*x-10)/(2*x-5) = 3 // - 3
(6*x-10)/(2*x-5)-3 = 0
(6*x-10)/(2*x-5)+(-3*(2*x-5))/(2*x-5) = 0
6*x-3*(2*x-5)-10 = 0
5 = 0
5/(2*x-5) = 0
5/(2*x-5) = 0 // * 2*x-5
5 = 0
x belongs to the empty set
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