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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9-(2/w)-1 = 4/w+2 // - 4/w+2
9-(2/w)-(4/w)-2-1 = 0
9-2*w^-1-4*w^-1-2-1 = 0
-6*w^-1 = -6 // : -6
w^-1 = 1
-1 < 0
1/(w^1) = 1 // * w^1
1 = 1*w^1 // : 1
1 = w^1
w = 1
w = 1
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