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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x = 150/60 // - 150/60
30/x-(150/60) = 0
30/x-5/2 = 0
30*x^-1 = 5/2 // : 30
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
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