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w in (-oo:+oo)
(3/7)*w-11 = 4/7 // - 4/7
(3/7)*w-(4/7)-11 = 0
(3/7)*w-4/7-11 = 0
3/7*w-81/7 = 0 // + 81/7
3/7*w = 81/7 // : 3/7
w = 81/7/3/7
w = 27
w = 27
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