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w in (-oo:+oo)
(3/4)*w = 21/30 // - 21/30
(3/4)*w-(21/30) = 0
(3/4)*w-7/10 = 0
3/4*w-7/10 = 0 // + 7/10
3/4*w = 7/10 // : 3/4
w = 7/10/3/4
w = 14/15
w = 14/15
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