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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/180 = 5/x // - 5/x
22/180-(5/x) = 0
22/180-5*x^-1 = 0
-5*x^-1 = -11/90 // : -5
x^-1 = 11/450
-1 < 0
1/(x^1) = 11/450 // * x^1
1 = 11/450*x^1 // : 11/450
450/11 = x^1
x = 450/11
x = 450/11
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