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w in (-oo:+oo)
(w+2)/6 = 12/9 // - 12/9
(w+2)/6-(12/9) = 0
(w+2)/6-4/3 = 0
(3*(w+2))/(3*6)+(-4*6)/(3*6) = 0
3*(w+2)-4*6 = 0
3*w-18 = 0
(3*w-18)/(3*6) = 0
(3*w-18)/(3*6) = 0 // * 3*6
3*w-18 = 0
3*w-18 = 0 // + 18
3*w = 18 // : 3
w = 18/3
w = 6
w = 6
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