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