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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x-5 = 2 // - 2
30/x-5-2 = 0
30*x^-1 = 7 // : 30
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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