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w in (-oo:+oo)
(4/5)*w-(1/2) = -2/3 // + -2/3
(4/5)*w-(1/2)-(-2/3) = 0
(4/5)*w-1/2+2/3 = 0
4/5*w+1/6 = 0 // - 1/6
4/5*w = -1/6 // : 4/5
w = -1/6/4/5
w = -5/24
w = -5/24
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