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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/x-(30/x)-5-5 = 0
(6*x)/x-30*x^-1-5-5 = 0
-30*x^-1 = 4 // : -30
x^-1 = -2/15
-1 < 0
1/(x^1) = -2/15 // * x^1
1 = -2/15*x^1 // : -2/15
-15/2 = x^1
x = -15/2
x = -15/2
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