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w in (-oo:+oo)
8*w = 21/2 // - 21/2
8*w-(21/2) = 0
8*w-21/2 = 0
8*w-21/2 = 0 // + 21/2
8*w = 21/2 // : 8
w = 21/2/8
w = 21/16
w = 21/16
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