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w in (-oo:+oo)
w/(-2)+15 = 3+9 // - 3+9
w/(-2)-9-3+15 = 0
3-1/2*w = 0 // - 3
-1/2*w = -3 // : -1/2
w = -3/(-1/2)
w = 6
w = 6
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