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w in (-oo:+oo)
(2/5)*w+1 = 33/25 // - 33/25
(2/5)*w-(33/25)+1 = 0
(2/5)*w-33/25+1 = 0
2/5*w-8/25 = 0 // + 8/25
2/5*w = 8/25 // : 2/5
w = 8/25/2/5
w = 4/5
w = 4/5
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