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D( x )
4*x-8 = 0
10*x-(5*x) = 0
4*x-8 = 0
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
10*x-(5*x) = 0
10*x-(5*x) = 0
10*x-5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
10/(4*x-8)-(15/(10*x-(5*x))) = 0
10/(4*x-8)-15*(10*x-5*x)^-1 = 0
10/(4*x-8)-15/(5*x) = 0
(5*10*x)/(5*x*(4*x-8))+(-15*(4*x-8))/(5*x*(4*x-8)) = 0
5*10*x-15*(4*x-8) = 0
120-10*x = 0
(120-10*x)/(5*x*(4*x-8)) = 0
(120-10*x)/(5*x*(4*x-8)) = 0 // * 5*x*(4*x-8)
120-10*x = 0
120-10*x = 0 // - 120
-10*x = -120 // : -10
x = -120/(-10)
x = 12
x = 12
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