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