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w in (-oo:+oo)
(3/15)*w+1/5 = 4/5 // - 4/5
(3/15)*w+1/5-(4/5) = 0
(3/15)*w+1/5-4/5 = 0
1/5*w-3/5 = 0 // + 3/5
1/5*w = 3/5 // : 1/5
w = 3/5/1/5
w = 3
w = 3
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