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