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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
320/300 = 183.8/x // - 183.8/x
320/300-(183.8/x) = 0
320/300-183.8*x^-1 = 0
-183.8*x^-1 = -16/15 // : -183.8
x^-1 = 0.00580341
-1 < 0
1/(x^1) = 0.00580341 // * x^1
1 = 0.00580341*x^1 // : 0.00580341
172.31248525 = x^1
x = 172.31248525
x = 172.31248525
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