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w in (-oo:+oo)
40 = (5/8)*w // - (5/8)*w
40-((5/8)*w) = 0
(-5/8)*w+40 = 0
40-5/8*w = 0 // - 40
-5/8*w = -40 // : -5/8
w = -40/(-5/8)
w = 64
w = 64
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