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D( x )
2*x-5 = 0
x-4 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:5/2) U (5/2:4) U (4:+oo)
(2*x)/(2*x-5)-(1/(x-4)) = 1 // - 1
(2*x)/(2*x-5)-(1/(x-4))-1 = 0
(2*x)/(2*x-5)-(x-4)^-1-1 = 0
(2*x)/(2*x-5)-1/(x-4)-1 = 0
(2*x*(x-4))/((2*x-5)*(x-4))+(-1*(2*x-5))/((2*x-5)*(x-4))+(-1*(2*x-5)*(x-4))/((2*x-5)*(x-4)) = 0
2*x*(x-4)-1*(2*x-5)-1*(2*x-5)*(x-4) = 0
2*x^2-2*x^2-10*x+13*x-20+5 = 0
3*x-15 = 0
(3*x-15)/((2*x-5)*(x-4)) = 0
(3*x-15)/((2*x-5)*(x-4)) = 0 // * (2*x-5)*(x-4)
3*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x = 5
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