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w in (-oo:+oo)
w/(-4) = -2/3 // + -2/3
w/(-4)-(-2/3) = 0
w/(-4)+2/3 = 0
2/3-1/4*w = 0 // - 2/3
-1/4*w = -2/3 // : -1/4
w = -2/3/(-1/4)
w = 8/3
w = 8/3
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