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D( x )
54*x^14*y^18 < 0
54*x^14*y^18 < 0
54*x^14*y^18 < 0
54*x^14*y^18 = 0
54*x^14*y^18 = 0 // : 54*y^18
x^14 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(54*x^14*y^18)^(1/2) = 0
3*6^(1/2)*x^7*y^9 = 0 // : 3*6^(1/2)*y^9
x^7 = 0
x = 0
x = 0
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