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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(50/x)*x = 2.5*x*(50/x+2.5) // - 2.5*x*(50/x+2.5)
(50/x)*x-(2.5*x*(50/x+2.5)) = 0
(50/x)*x-2.5*x*(50/x+2.5) = 0
50-2.5*x*(50*x^-1+2.5) = 0
50-2.5*x*(50*x^-1+2.5) = 0
-6.25*x-75 = 0
-6.25*x-75 = 0
-6.25*x-75 = 0 // + 75
-6.25*x = 75 // : -6.25
x = 75/(-6.25)
x = -12
x = -12
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