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w in (-oo:+oo)
2/7-4*w = 162/77 // - 162/77
2/7-4*w-(162/77) = 0
2/7-4*w-162/77 = 0
-4*w-20/11 = 0 // + 20/11
-4*w = 20/11 // : -4
w = 20/11/(-4)
w = -5/11
w = -5/11
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