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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/11 = 12/x // - 12/x
5/11-(12/x) = 0
5/11-12*x^-1 = 0
-12*x^-1 = -5/11 // : -12
x^-1 = 5/132
-1 < 0
1/(x^1) = 5/132 // * x^1
1 = 5/132*x^1 // : 5/132
132/5 = x^1
x = 132/5
x = 132/5
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