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w in (-oo:+oo)
35 = (7/8)*w // - (7/8)*w
35-((7/8)*w) = 0
(-7/8)*w+35 = 0
35-7/8*w = 0 // - 35
-7/8*w = -35 // : -7/8
w = -35/(-7/8)
w = 40
w = 40
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