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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.88 = 121/x // - 121/x
0.88-(121/x) = 0
0.88-121*x^-1 = 0
-121*x^-1 = -0.88 // : -121
x^-1 = 0.00727273
-1 < 0
1/(x^1) = 0.00727273 // * x^1
1 = 0.00727273*x^1 // : 0.00727273
137.49994844 = x^1
x = 137.49994844
x = 137.49994844
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