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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2/x = 1 // - 1
1.2/x-1 = 0
1.2*x^-1 = 1 // : 1.2
x^-1 = 0.83333333
-1 < 0
1/(x^1) = 0.83333333 // * x^1
1 = 0.83333333*x^1 // : 0.83333333
1.2 = x^1
x = 1.2
x = 1.2
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