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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
29/200 = 22/x // - 22/x
29/200-(22/x) = 0
29/200-22*x^-1 = 0
-22*x^-1 = -29/200 // : -22
x^-1 = 29/4400
-1 < 0
1/(x^1) = 29/4400 // * x^1
1 = 29/4400*x^1 // : 29/4400
4400/29 = x^1
x = 4400/29
x = 4400/29
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