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w in (-oo:+oo)
56 = (7/2)*w // - (7/2)*w
56-((7/2)*w) = 0
(-7/2)*w+56 = 0
56-7/2*w = 0 // - 56
-7/2*w = -56 // : -7/2
w = -56/(-7/2)
w = 16
w = 16
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