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