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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
74/876 = 103/x // - 103/x
74/876-(103/x) = 0
74/876-103*x^-1 = 0
-103*x^-1 = -37/438 // : -103
x^-1 = 37/45114
-1 < 0
1/(x^1) = 37/45114 // * x^1
1 = 37/45114*x^1 // : 37/45114
45114/37 = x^1
x = 45114/37
x = 45114/37
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