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w in (-oo:+oo)
3/7-11 = (-4/7)*w // - (-4/7)*w
3/7-((-4/7)*w)-11 = 0
(4/7)*w+3/7-11 = 0
4/7*w-74/7 = 0 // + 74/7
4/7*w = 74/7 // : 4/7
w = 74/7/4/7
w = 37/2
w = 37/2
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