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D( x )
x^14 = 0
x^14 = 0
x^14 = 0
1*x^14 = 0 // : 1
x^14 = 0
x = 0
x in (-oo:0) U (0:+oo)
x*x^6*y^12-(2/(x^14)) = 0
x*x^6*y^12-2*x^-14 = 0
x^7*y^12-2*x^-14 = 0
x^7*(y^12-2*x^-21) = 0
-2*x^-21 = -y^12 // : -2
x^-21 = (y^12)/2
-21 < 0
1/(x^21) = (y^12)/2 // * x^21
1 = x^21*((y^12)/2) // : (y^12)/2
2*y^-12 = x^21
x^21 = 2*y^-12 // ^ 1/21
x = 2^(1/21)*y^(-4/7)
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in { 0}
x = 2^(1/21)*y^(-4/7)
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