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D( w )
w^18 = 0
w^18 = 0
w^18 = 0
1*w^18 = 0 // : 1
w^18 = 0
w = 0
w in (-oo:0) U (0:+oo)
(1*(-27/8))/(w^18) = 0
(-27/8)/(w^18) = 0
-27/8*w^-18 = 0 // : -27/8
w^-18 = 0
w naleu017Cy do O
w belongs to the empty set
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