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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
610/x = 10 // - 10
610/x-10 = 0
610*x^-1 = 10 // : 610
x^-1 = 1/61
-1 < 0
1/(x^1) = 1/61 // * x^1
1 = 1/61*x^1 // : 1/61
61 = x^1
x = 61
x = 61
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