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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/12 = 48/x // - 48/x
10/12-(48/x) = 0
10/12-48*x^-1 = 0
-48*x^-1 = -5/6 // : -48
x^-1 = 5/288
-1 < 0
1/(x^1) = 5/288 // * x^1
1 = 5/288*x^1 // : 5/288
288/5 = x^1
x = 288/5
x = 288/5
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