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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/12 = 6/x+5 // - 6/x+5
9/12-(6/x)-5 = 0
9/12-6*x^-1-5 = 0
-6*x^-1 = 17/4 // : -6
x^-1 = -17/24
-1 < 0
1/(x^1) = -17/24 // * x^1
1 = -17/24*x^1 // : -17/24
-24/17 = x^1
x = -24/17
x = -24/17
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