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w in (-oo:+oo)
6.4 = w/2 // - w/2
6.4-(w/2) = 0
6.4-1/2*w = 0 // - 6.4
-1/2*w = -6.4 // : -1/2
w = -6.4/(-1/2)
w = 12.8
w = 12.8
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