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w in (-oo:+oo)
(-3/7)*w-w+4/7 = -44/63 // + -44/63
(-3/7)*w-w+4/7-(-44/63) = 0
(-3/7)*w-w+4/7+44/63 = 0
80/63-10/7*w = 0 // - 80/63
-10/7*w = -80/63 // : -10/7
w = -80/63/(-10/7)
w = 8/9
w = 8/9
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