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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 76/12 // - 76/12
1/x-(76/12) = 0
1/x-19/3 = 0
1*x^-1 = 19/3 // : 1
x^-1 = 19/3
-1 < 0
1/(x^1) = 19/3 // * x^1
1 = 19/3*x^1 // : 19/3
3/19 = x^1
x = 3/19
x = 3/19
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