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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
55/100 = 264/x // - 264/x
55/100-(264/x) = 0
55/100-264*x^-1 = 0
-264*x^-1 = -11/20 // : -264
x^-1 = 1/480
-1 < 0
1/(x^1) = 1/480 // * x^1
1 = 1/480*x^1 // : 1/480
480 = x^1
x = 480
x = 480
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