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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-18/w = 6/12 // - 6/12
-18/w-(6/12) = 0
-18/w-1/2 = 0
-18*w^-1 = 1/2 // : -18
w^-1 = -1/36
-1 < 0
1/(w^1) = -1/36 // * w^1
1 = -1/36*w^1 // : -1/36
-36 = w^1
w = -36
w = -36
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