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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7 = 1.2/x // - 1.2/x
7-(1.2/x) = 0
7-1.2*x^-1 = 0
-1.2*x^-1 = -7 // : -1.2
x^-1 = 5.83333333
-1 < 0
1/(x^1) = 5.83333333 // * x^1
1 = 5.83333333*x^1 // : 5.83333333
0.17142857 = x^1
x = 0.17142857
x = 0.17142857
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