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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
78/x = 4368 // - 4368
78/x-4368 = 0
78*x^-1 = 4368 // : 78
x^-1 = 56
-1 < 0
1/(x^1) = 56 // * x^1
1 = 56*x^1 // : 56
1/56 = x^1
x = 1/56
x = 1/56
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