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