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D( x )
2*x-5 = 0
2*x-1 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:5/2) U (5/2:+oo)
x/(2*x-5) = (x+3)/(2*x-1) // - (x+3)/(2*x-1)
x/(2*x-5)-((x+3)/(2*x-1)) = 0
x/(2*x-5)+(-1*(x+3))/(2*x-1) = 0
(x*(2*x-1))/((2*x-5)*(2*x-1))+(-1*(x+3)*(2*x-5))/((2*x-5)*(2*x-1)) = 0
x*(2*x-1)-1*(x+3)*(2*x-5) = 0
15-2*x = 0
(15-2*x)/((2*x-5)*(2*x-1)) = 0
(15-2*x)/((2*x-5)*(2*x-1)) = 0 // * (2*x-5)*(2*x-1)
15-2*x = 0
15-2*x = 0 // - 15
-2*x = -15 // : -2
x = -15/(-2)
x = 15/2
x = 15/2
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