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w in (-oo:+oo)
(5/6)*w-4/7 = -202/231 // + -202/231
(5/6)*w-4/7-(-202/231) = 0
(5/6)*w-4/7+202/231 = 0
5/6*w+10/33 = 0 // - 10/33
5/6*w = -10/33 // : 5/6
w = -10/33/5/6
w = -4/11
w = -4/11
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