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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/25 = 238/x // - 238/x
10/25-(238/x) = 0
10/25-238*x^-1 = 0
-238*x^-1 = -2/5 // : -238
x^-1 = 1/595
-1 < 0
1/(x^1) = 1/595 // * x^1
1 = 1/595*x^1 // : 1/595
595 = x^1
x = 595
x = 595
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