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