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D( q )
(4*q)^14 = 0
(4*q)^14 = 0
(4*q)^14 = 0
268435456*q^14 = 0 // : 268435456
q^14 = 0
q = 0
q in (-oo:0) U (0:+oo)
((4*q)^7)/((4*q)^14) = 0
1/16384*q^-7 = 0 // : 1/16384
q^-7 = 0
q naleu017Cy do O
q belongs to the empty set
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