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D( x )
32*w^16*x^7 < 0
32*w^16*x^7 < 0
32*w^16*x^7 < 0
32*w^16*x^7 = 0
32*w^16*x^7 = 0 // : 32*w^16
x^7 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(32*w^16*x^7)^(1/4) = 0
2*2^(1/4)*w^4*x^(7/4) = 0 // : 2*2^(1/4)*w^4
x^(7/4) = 0
x = 0
x = 0
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