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w in (-oo:+oo)
(11/2)*w+7 = 12 // - 12
(11/2)*w-12+7 = 0
11/2*w-5 = 0 // + 5
11/2*w = 5 // : 11/2
w = 5/11/2
w = 10/11
w = 10/11
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