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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/2.7 = 40/x // - 40/x
6/2.7-(40/x) = 0
6/2.7-40*x^-1 = 0
-40*x^-1 = -2.22222222 // : -40
x^-1 = 0.05555556
-1 < 0
1/(x^1) = 0.05555556 // * x^1
1 = 0.05555556*x^1 // : 0.05555556
17.99999856 = x^1
x = 17.99999856
x = 17.99999856
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