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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/y = 5/x // - 5/x
30/y-(5/x) = 0
30/y-5*x^-1 = 0
-5*x^-1 = -(30*y^-1) // : -5
x^-1 = 6*y^-1
-1 < 0
1/(x^1) = 6*y^-1 // * x^1
1 = 6*x^1*y^-1 // : 6*y^-1
1/(6*y^-1) = x^1
x = 1/(6*y^-1)
x = 1/(6*y^-1)
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