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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15.4 = -17.4/x // + -17.4/x
15.4-(-17.4/x) = 0
17.4*x^-1+15.4 = 0
17.4*x^-1 = -15.4 // : 17.4
x^-1 = -0.88505747
-1 < 0
1/(x^1) = -0.88505747 // * x^1
1 = -0.88505747*x^1 // : -0.88505747
-1.12987013 = x^1
x = -1.12987013
x = -1.12987013
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