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w in (-oo:+oo)
(2/5)*w+2/5 = 4/5 // - 4/5
(2/5)*w+2/5-(4/5) = 0
(2/5)*w+2/5-4/5 = 0
2/5*w-2/5 = 0 // + 2/5
2/5*w = 2/5 // : 2/5
w = 2/5/2/5
w = 1
w = 1
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