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