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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3 = -8/w-2 // + -8/w-2
2-(-8/w)+3 = 0
8*w^-1+2+3 = 0
8*w^-1 = -5 // : 8
w^-1 = -5/8
-1 < 0
1/(w^1) = -5/8 // * w^1
1 = -5/8*w^1 // : -5/8
-8/5 = w^1
w = -8/5
w = -8/5
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