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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30 = 60/x-3 // - 60/x-3
3-(60/x)+30 = 0
3-60*x^-1+30 = 0
-60*x^-1 = -33 // : -60
x^-1 = 11/20
-1 < 0
1/(x^1) = 11/20 // * x^1
1 = 11/20*x^1 // : 11/20
20/11 = x^1
x = 20/11
x = 20/11
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