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w in (-oo:+oo)
(3/7)*w-11 = (-5/7)*w // - (-5/7)*w
(3/7)*w-((-5/7)*w)-11 = 0
(3/7)*w+(5/7)*w-11 = 0
8/7*w-11 = 0 // + 11
8/7*w = 11 // : 8/7
w = 11/8/7
w = 77/8
w = 77/8
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