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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6-(5/w)-2 = 2/w+1 // - 2/w+1
6-(5/w)-(2/w)-2-1 = 0
6-5*w^-1-2*w^-1-2-1 = 0
-7*w^-1 = -3 // : -7
w^-1 = 3/7
-1 < 0
1/(w^1) = 3/7 // * w^1
1 = 3/7*w^1 // : 3/7
7/3 = w^1
w = 7/3
w = 7/3
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