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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-2/3 = 18/w // - 18/w
-(18/w)-2/3 = 0
-18*w^-1-2/3 = 0
-18*w^-1 = 2/3 // : -18
w^-1 = -1/27
-1 < 0
1/(w^1) = -1/27 // * w^1
1 = -1/27*w^1 // : -1/27
-27 = w^1
w = -27
w = -27
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