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