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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 19/114 // - 19/114
7/x-(19/114) = 0
7/x-1/6 = 0
7*x^-1 = 1/6 // : 7
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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