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D( x )
50*x = 0
50*x = 0
50*x = 0
50*x = 0 // : 50
x = 0
x in (-oo:0) U (0:+oo)
(50-x)/(50*x) = 1/61 // - 1/61
(50-x)/(50*x)-(1/61) = 0
(50-x)/(50*x)-1/61 = 0
(61*(50-x))/(50*61*x)+(-1*50*x)/(50*61*x) = 0
61*(50-x)-1*50*x = 0
3050-111*x = 0
(3050-111*x)/(50*61*x) = 0
(3050-111*x)/(50*61*x) = 0 // * 50*61*x
3050-111*x = 0
3050-111*x = 0 // - 3050
-111*x = -3050 // : -111
x = -3050/(-111)
x = 3050/111
x = 3050/111
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