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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15 = (x-20000000)/x // - (x-20000000)/x
0.15-((x-20000000)/x) = 0
(-1*(x-20000000))/x+0.15 = 0
(-1*(x-20000000))/x+(0.15*x)/x = 0
0.15*x-1*(x-20000000) = 0
20000000-0.85*x = 0
(20000000-0.85*x)/x = 0
(20000000-0.85*x)/x = 0 // * x
20000000-0.85*x = 0
20000000-0.85*x = 0 // - 20000000
-0.85*x = -20000000 // : -0.85
x = -20000000/(-0.85)
x = 23529411.76470588
x = 23529411.76470588
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