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D( x )
2*x-5 = 0
2*x-4 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:5/2) U (5/2:+oo)
(x-3)/(2*x-4) = (x-2)/(2*x-5) // - (x-2)/(2*x-5)
(x-3)/(2*x-4)-((x-2)/(2*x-5)) = 0
(x-3)/(2*x-4)+(-1*(x-2))/(2*x-5) = 0
((x-3)*(2*x-5))/((2*x-4)*(2*x-5))+(-1*(x-2)*(2*x-4))/((2*x-4)*(2*x-5)) = 0
(x-3)*(2*x-5)-1*(x-2)*(2*x-4) = 0
7-3*x = 0
(7-3*x)/((2*x-4)*(2*x-5)) = 0
(7-3*x)/((2*x-4)*(2*x-5)) = 0 // * (2*x-4)*(2*x-5)
7-3*x = 0
7-3*x = 0 // - 7
-3*x = -7 // : -3
x = -7/(-3)
x = 7/3
x = 7/3
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