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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1 = 7-(132/w) // - 7-(132/w)
132/w-7+1 = 0
132*w^-1 = 6 // : 132
w^-1 = 1/22
-1 < 0
1/(w^1) = 1/22 // * w^1
1 = 1/22*w^1 // : 1/22
22 = w^1
w = 22
w = 22
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