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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.6 = (x-25000)/x // - (x-25000)/x
0.6-((x-25000)/x) = 0
(-1*(x-25000))/x+0.6 = 0
(-1*(x-25000))/x+(0.6*x)/x = 0
0.6*x-1*(x-25000) = 0
25000-0.4*x = 0
(25000-0.4*x)/x = 0
(25000-0.4*x)/x = 0 // * x
25000-0.4*x = 0
25000-0.4*x = 0 // - 25000
-0.4*x = -25000 // : -0.4
x = -25000/(-0.4)
x = 62500
x = 62500
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