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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/5 = 60/x // - 60/x
1/5-(60/x) = 0
1/5-60*x^-1 = 0
-60*x^-1 = -1/5 // : -60
x^-1 = 1/300
-1 < 0
1/(x^1) = 1/300 // * x^1
1 = 1/300*x^1 // : 1/300
300 = x^1
x = 300
x = 300
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