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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22.4 = 2.5/x // - 2.5/x
22.4-(2.5/x) = 0
22.4-2.5*x^-1 = 0
-2.5*x^-1 = -22.4 // : -2.5
x^-1 = 8.96
-1 < 0
1/(x^1) = 8.96 // * x^1
1 = 8.96*x^1 // : 8.96
0.11160714 = x^1
x = 0.11160714
x = 0.11160714
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