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w in (-oo:+oo)
(2/7)*w-11 = (-4/7)*w // - (-4/7)*w
(2/7)*w-((-4/7)*w)-11 = 0
(2/7)*w+(4/7)*w-11 = 0
6/7*w-11 = 0 // + 11
6/7*w = 11 // : 6/7
w = 11/6/7
w = 77/6
w = 77/6
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