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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
101/60 = 72/x // - 72/x
101/60-(72/x) = 0
101/60-72*x^-1 = 0
-72*x^-1 = -101/60 // : -72
x^-1 = 101/4320
-1 < 0
1/(x^1) = 101/4320 // * x^1
1 = 101/4320*x^1 // : 101/4320
4320/101 = x^1
x = 4320/101
x = 4320/101
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