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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-15)/x = 0.25 // - 0.25
(x-15)/x-0.25 = 0
(x-15)/x+(-0.25*x)/x = 0
x-0.25*x-15 = 0
0.75*x-15 = 0
(0.75*x-15)/x = 0
(0.75*x-15)/x = 0 // * x
0.75*x-15 = 0
0.75*x-15 = 0 // + 15
0.75*x = 15 // : 0.75
x = 15/0.75
x = 20
x = 20
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