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w in (-oo:+oo)
-4 = 5/(-4)-7*w // - 5/(-4)-7*w
-(-7*w)-(5/(-4))-4 = 0
7*w+5/4-4 = 0
7*w-11/4 = 0 // + 11/4
7*w = 11/4 // : 7
w = 11/4/7
w = 11/28
w = 11/28
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