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w in (-oo:+oo)
(3/5)*w+4 = (8/5)*w // - (8/5)*w
(3/5)*w-((8/5)*w)+4 = 0
(3/5)*w+(-8/5)*w+4 = 0
4-w = 0 // - 4
-w = -4 // * -1
w = 4
w = 4
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