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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14 = 60/x // - 60/x
14-(60/x) = 0
14-60*x^-1 = 0
-60*x^-1 = -14 // : -60
x^-1 = 7/30
-1 < 0
1/(x^1) = 7/30 // * x^1
1 = 7/30*x^1 // : 7/30
30/7 = x^1
x = 30/7
x = 30/7
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