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