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w in (-oo:+oo)
(7/2)*w-1 = 2*w+5 // - 2*w+5
(7/2)*w-(2*w)-5-1 = 0
(7/2)*w-2*w-5-1 = 0
3/2*w-6 = 0 // + 6
3/2*w = 6 // : 3/2
w = 6/3/2
w = 4
w = 4
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