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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/38 = 2.25/x // - 2.25/x
1/38-(2.25/x) = 0
1/38-2.25*x^-1 = 0
-2.25*x^-1 = -1/38 // : -2.25
x^-1 = 0.01169591
-1 < 0
1/(x^1) = 0.01169591 // * x^1
1 = 0.01169591*x^1 // : 0.01169591
85.49997392 = x^1
x = 85.49997392
x = 85.49997392
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