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w in (-oo:+oo)
(-5/8)*w = 1 // - 1
(-5/8)*w-1 = 0
-5/8*w-1 = 0 // + 1
-5/8*w = 1 // : -5/8
w = 1/(-5/8)
w = -8/5
w = -8/5
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