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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/5)/60 = 100/x // - 100/x
(4/5)/60-(100/x) = 0
(4/5)/60-100*x^-1 = 0
-100*x^-1 = -1/75 // : -100
x^-1 = 1/7500
-1 < 0
1/(x^1) = 1/7500 // * x^1
1 = 1/7500*x^1 // : 1/7500
7500 = x^1
x = 7500
x = 7500
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