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w in (-oo:+oo)
w/(-2) = 5/7 // - 5/7
w/(-2)-(5/7) = 0
w/(-2)-5/7 = 0
-1/2*w-5/7 = 0 // + 5/7
-1/2*w = 5/7 // : -1/2
w = 5/7/(-1/2)
w = -10/7
w = -10/7
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