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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-(1/w)-2+2 = (1/3)*w-6 // - (1/3)*w-6
1/w-((1/3)*w)-(1/w)-2+2+6 = 0
(-1/3)*w+1/w-w^-1-2+2+6 = 0
6-1/3*w = 0 // - 6
-1/3*w = -6 // : -1/3
w = -6/(-1/3)
w = 18
w = 18
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