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w in (-oo:+oo)
(2/5)*w-w = (-3/5)*w-(2/5) // - (-3/5)*w-(2/5)
(2/5)*w-w-((-3/5)*w)+2/5 = 0
(2/5)*w-w+(3/5)*w+2/5 = 0
2/5 = 0
w belongs to the empty set
w belongs to the empty set
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