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w in (-oo:+oo)
(4/5)*w = 28/35 // - 28/35
(4/5)*w-(28/35) = 0
(4/5)*w-4/5 = 0
4/5*w-4/5 = 0 // + 4/5
4/5*w = 4/5 // : 4/5
w = 4/5/4/5
w = 1
w = 1
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