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w in (-oo:+oo)
(4/7)*w-(4/5) = -1/2 // + -1/2
(4/7)*w-(4/5)-(-1/2) = 0
(4/7)*w-4/5+1/2 = 0
4/7*w-3/10 = 0 // + 3/10
4/7*w = 3/10 // : 4/7
w = 3/10/4/7
w = 21/40
w = 21/40
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