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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
10/7 = 12/w-12 // - 12/w-12
10/7-(12/w)+12 = 0
10/7-12*w^-1+12 = 0
-12*w^-1 = -94/7 // : -12
w^-1 = 47/42
-1 < 0
1/(w^1) = 47/42 // * w^1
1 = 47/42*w^1 // : 47/42
42/47 = w^1
w = 42/47
w = 42/47
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