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w in (-oo:+oo)
(4/7)*w = 16/21 // - 16/21
(4/7)*w-(16/21) = 0
(4/7)*w-16/21 = 0
4/7*w-16/21 = 0 // + 16/21
4/7*w = 16/21 // : 4/7
w = 16/21/4/7
w = 4/3
w = 4/3
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