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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40 = 9/x // - 9/x
40-(9/x) = 0
40-9*x^-1 = 0
-9*x^-1 = -40 // : -9
x^-1 = 40/9
-1 < 0
1/(x^1) = 40/9 // * x^1
1 = 40/9*x^1 // : 40/9
9/40 = x^1
x = 9/40
x = 9/40
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