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w in (-oo:+oo)
3/2 = (-2/3)*w+(5/6)*w+2 // - (-2/3)*w+(5/6)*w+2
3/2-((-2/3)*w)-((5/6)*w)-2 = 0
(2/3)*w+(-5/6)*w+3/2-2 = 0
-1/6*w-1/2 = 0 // + 1/2
-1/6*w = 1/2 // : -1/6
w = 1/2/(-1/6)
w = -3
w = -3
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