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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2352/x = 56 // - 56
2352/x-56 = 0
2352*x^-1 = 56 // : 2352
x^-1 = 1/42
-1 < 0
1/(x^1) = 1/42 // * x^1
1 = 1/42*x^1 // : 1/42
42 = x^1
x = 42
x = 42
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