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D( x )
23-x = 0
23-x = 0
23-x = 0
23-x = 0 // - 23
-x = -23 // * -1
x = 23
x in (-oo:23) U (23:+oo)
600/(23-x) = 50 // - 50
600/(23-x)-50 = 0
600/(23-x)+(-50*(23-x))/(23-x) = 0
600-50*(23-x) = 0
50*x-550 = 0
(50*x-550)/(23-x) = 0
(50*x-550)/(23-x) = 0 // * 23-x
50*x-550 = 0
50*x-550 = 0 // + 550
50*x = 550 // : 50
x = 550/50
x = 11
x = 11
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