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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x-1 = 9/6 // - 9/6
12/x-(9/6)-1 = 0
12/x-3/2-1 = 0
12*x^-1 = 5/2 // : 12
x^-1 = 5/24
-1 < 0
1/(x^1) = 5/24 // * x^1
1 = 5/24*x^1 // : 5/24
24/5 = x^1
x = 24/5
x = 24/5
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