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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
73/24 = 100/x // - 100/x
73/24-(100/x) = 0
73/24-100*x^-1 = 0
-100*x^-1 = -73/24 // : -100
x^-1 = 73/2400
-1 < 0
1/(x^1) = 73/2400 // * x^1
1 = 73/2400*x^1 // : 73/2400
2400/73 = x^1
x = 2400/73
x = 2400/73
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