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D( x )
2*x-1 = 0
x-4 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:1/2) U (1/2:4) U (4:+oo)
15/(2*x-1) = (5/3)/(x-4) // - (5/3)/(x-4)
15/(2*x-1)-((5/3)/(x-4)) = 0
15/(2*x-1)+(-5/3)*(x-4)^-1 = 0
15/(2*x-1)-5/3/(x-4) = 0
(15*(x-4))/((2*x-1)*(x-4))+(-5/3*(2*x-1))/((2*x-1)*(x-4)) = 0
15*(x-4)-5/3*(2*x-1) = 0
35/3*x-175/3 = 0
(35/3*x-175/3)/((2*x-1)*(x-4)) = 0
(35/3*x-175/3)/((2*x-1)*(x-4)) = 0 // * (2*x-1)*(x-4)
35/3*x-175/3 = 0
35/3*x-175/3 = 0 // + 175/3
35/3*x = 175/3 // : 35/3
x = 175/3/35/3
x = 5
x = 5
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