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