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w in (-oo:+oo)
w/(-3)-1+6 = 2 // - 2
w/(-3)-2-1+6 = 0
3-1/3*w = 0 // - 3
-1/3*w = -3 // : -1/3
w = -3/(-1/3)
w = 9
w = 9
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