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w in (-oo:+oo)
(2/7)*w-w+1/5 = 1/5 // - 1/5
(2/7)*w-w+1/5-(1/5) = 0
(2/7)*w-w+1/5-1/5 = 0
-5/7*w = 0 // : -5/7
w = 0
w = 0
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