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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(100-x)/x = 1.15 // - 1.15
(100-x)/x-1.15 = 0
(100-x)/x+(-1.15*x)/x = 0
100-x-1.15*x = 0
100-2.15*x = 0
(100-2.15*x)/x = 0
(100-2.15*x)/x = 0 // * x
100-2.15*x = 0
100-2.15*x = 0 // - 100
-2.15*x = -100 // : -2.15
x = -100/(-2.15)
x = 46.51162791
x = 46.51162791
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