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w in (-oo:+oo)
56 = (7/8)*w // - (7/8)*w
56-((7/8)*w) = 0
(-7/8)*w+56 = 0
56-7/8*w = 0 // - 56
-7/8*w = -56 // : -7/8
w = -56/(-7/8)
w = 64
w = 64
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