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w in (-oo:+oo)
(-2/3)*w = -4/27 // + -4/27
(-2/3)*w-(-4/27) = 0
(-2/3)*w+4/27 = 0
4/27-2/3*w = 0 // - 4/27
-2/3*w = -4/27 // : -2/3
w = -4/27/(-2/3)
w = 2/9
w = 2/9
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