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w in (-oo:+oo)
5 = (4/7)*w // - (4/7)*w
5-((4/7)*w) = 0
(-4/7)*w+5 = 0
5-4/7*w = 0 // - 5
-4/7*w = -5 // : -4/7
w = -5/(-4/7)
w = 35/4
w = 35/4
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