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w in (-oo:+oo)
56 = (7/4)*w // - (7/4)*w
56-((7/4)*w) = 0
(-7/4)*w+56 = 0
56-7/4*w = 0 // - 56
-7/4*w = -56 // : -7/4
w = -56/(-7/4)
w = 32
w = 32
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