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w in (-oo:+oo)
w/2+6 = 3*w+1 // - 3*w+1
w/2-(3*w)-1+6 = 0
w/2-3*w-1+6 = 0
5-5/2*w = 0 // - 5
-5/2*w = -5 // : -5/2
w = -5/(-5/2)
w = 2
w = 2
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