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w in (-oo:+oo)
87/5 = (8/5)*w // - (8/5)*w
87/5-((8/5)*w) = 0
(-8/5)*w+87/5 = 0
87/5-8/5*w = 0 // - 87/5
-8/5*w = -87/5 // : -8/5
w = -87/5/(-8/5)
w = 87/8
w = 87/8
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