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w in (-oo:+oo)
(-3/7)*w = 30/77 // - 30/77
(-3/7)*w-(30/77) = 0
(-3/7)*w-30/77 = 0
-3/7*w-30/77 = 0 // + 30/77
-3/7*w = 30/77 // : -3/7
w = 30/77/(-3/7)
w = -10/11
w = -10/11
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