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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x)/x-(60/x)-6-6 = 0
(10*x)/x-60*x^-1-6-6 = 0
-60*x^-1 = 2 // : -60
x^-1 = -1/30
-1 < 0
1/(x^1) = -1/30 // * x^1
1 = -1/30*x^1 // : -1/30
-30 = x^1
x = -30
x = -30
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