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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) = 60^-1 // - 60^-1
(50-x)/(50*x)-60^-1 = 0
(50-x)/(50*x)-1/60 = 0
(60*(50-x))/(50*60*x)+(-1*50*x)/(50*60*x) = 0
60*(50-x)-1*50*x = 0
3000-110*x = 0
(3000-110*x)/(50*60*x) = 0
(3000-110*x)/(50*60*x) = 0 // * 50*60*x
3000-110*x = 0
3000-110*x = 0 // - 3000
-110*x = -3000 // : -110
x = -3000/(-110)
x = 300/11
x = 300/11
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