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