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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*y-(14/x) = 0
3*y-14*x^-1 = 0
-14*x^-1 = -(3*y) // : -14
x^-1 = (-3*y)/(-14)
-1 < 0
1/(x^1) = (-3*y)/(-14) // * x^1
1 = x^1*((-3*y)/(-14)) // : (-3*y)/(-14)
(14*y^-1)/3 = x^1
x = (14*y^-1)/3
x = (14*y^-1)/3
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