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w in (-oo:+oo)
8/5 = (4/7)*w // - (4/7)*w
8/5-((4/7)*w) = 0
(-4/7)*w+8/5 = 0
8/5-4/7*w = 0 // - 8/5
-4/7*w = -8/5 // : -4/7
w = -8/5/(-4/7)
w = 14/5
w = 14/5
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