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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
184/6 = 1288/x // - 1288/x
184/6-(1288/x) = 0
184/6-1288*x^-1 = 0
-1288*x^-1 = -92/3 // : -1288
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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