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D( x )
8*x-4 = 0
4*x-15 = 0
8*x-4 = 0
8*x-4 = 0
8*x-4 = 0 // + 4
8*x = 4 // : 8
x = 4/8
x = 1/2
4*x-15 = 0
4*x-15 = 0
4*x-15 = 0 // + 15
4*x = 15 // : 4
x = 15/4
x in (-oo:1/2) U (1/2:15/4) U (15/4:+oo)
(4*x+1)/(8*x-4) = (2*x+5)/(4*x-15) // - (2*x+5)/(4*x-15)
(4*x+1)/(8*x-4)-((2*x+5)/(4*x-15)) = 0
(4*x+1)/(8*x-4)+(-1*(2*x+5))/(4*x-15) = 0
((4*x+1)*(4*x-15))/((8*x-4)*(4*x-15))+(-1*(2*x+5)*(8*x-4))/((8*x-4)*(4*x-15)) = 0
(4*x+1)*(4*x-15)-1*(2*x+5)*(8*x-4) = 0
5-88*x = 0
(5-88*x)/((8*x-4)*(4*x-15)) = 0
(5-88*x)/((8*x-4)*(4*x-15)) = 0 // * (8*x-4)*(4*x-15)
5-88*x = 0
5-88*x = 0 // - 5
-88*x = -5 // : -88
x = -5/(-88)
x = 5/88
x = 5/88
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