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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
294/420 = 511/w // - 511/w
294/420-(511/w) = 0
294/420-511*w^-1 = 0
-511*w^-1 = -7/10 // : -511
w^-1 = 1/730
-1 < 0
1/(w^1) = 1/730 // * w^1
1 = 1/730*w^1 // : 1/730
730 = w^1
w = 730
w = 730
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