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w in (-oo:+oo)
(5/2)*w = 7.5 // - 7.5
(5/2)*w-7.5 = 0
5/2*w-7.5 = 0 // + 7.5
5/2*w = 7.5 // : 5/2
w = 7.5/5/2
w = 3
w = 3
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