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w in (-oo:+oo)
(w+2)/12 = 5/8 // - 5/8
(w+2)/12-(5/8) = 0
(w+2)/12-5/8 = 0
(8*(w+2))/(8*12)+(-5*12)/(8*12) = 0
8*(w+2)-5*12 = 0
8*w-44 = 0
(8*w-44)/(8*12) = 0
(8*w-44)/(8*12) = 0 // * 8*12
8*w-44 = 0
8*w-44 = 0 // + 44
8*w = 44 // : 8
w = 44/8
w = 11/2
w = 11/2
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