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