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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(1.4/x) = 0
1-1.4*x^-1 = 0
-1.4*x^-1 = -1 // : -1.4
x^-1 = 0.71428571
-1 < 0
1/(x^1) = 0.71428571 // * x^1
1 = 0.71428571*x^1 // : 0.71428571
1.40000001 = x^1
x = 1.40000001
x = 1.40000001
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