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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/5 = -12/x // + -12/x
6/5-(-12/x) = 0
12*x^-1+6/5 = 0
12*x^-1 = -6/5 // : 12
x^-1 = -1/10
-1 < 0
1/(x^1) = -1/10 // * x^1
1 = -1/10*x^1 // : -1/10
-10 = x^1
x = -10
x = -10
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