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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/300 = 183.8/x // - 183.8/x
100/300-(183.8/x) = 0
100/300-183.8*x^-1 = 0
-183.8*x^-1 = -1/3 // : -183.8
x^-1 = 0.00181357
-1 < 0
1/(x^1) = 0.00181357 // * x^1
1 = 0.00181357*x^1 // : 0.00181357
551.39862261 = x^1
x = 551.39862261
x = 551.39862261
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