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