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w in (-oo:+oo)
2/7-(4*w) = -29/21 // + -29/21
2/7-(4*w)-(-29/21) = 0
2/7-4*w+29/21 = 0
5/3-4*w = 0 // - 5/3
-4*w = -5/3 // : -4
w = -5/3/(-4)
w = 5/12
w = 5/12
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