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w in (-oo:+oo)
-4/5 = (5/7)*w // - (5/7)*w
-((5/7)*w)-4/5 = 0
(-5/7)*w-4/5 = 0
-5/7*w-4/5 = 0 // + 4/5
-5/7*w = 4/5 // : -5/7
w = 4/5/(-5/7)
w = -28/25
w = -28/25
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