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w in (-oo:+oo)
41/2 = 4*w-(1/2) // - 4*w-(1/2)
41/2-(4*w)+1/2 = 0
41/2-4*w+1/2 = 0
21-4*w = 0 // - 21
-4*w = -21 // : -4
w = -21/(-4)
w = 21/4
w = 21/4
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