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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
400/2400 = 290/x // - 290/x
400/2400-(290/x) = 0
400/2400-290*x^-1 = 0
-290*x^-1 = -1/6 // : -290
x^-1 = 1/1740
-1 < 0
1/(x^1) = 1/1740 // * x^1
1 = 1/1740*x^1 // : 1/1740
1740 = x^1
x = 1740
x = 1740
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