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w in (-oo:+oo)
(-3/7)*w+1/9 = -5/441 // + -5/441
(-3/7)*w+1/9-(-5/441) = 0
(-3/7)*w+1/9+5/441 = 0
6/49-3/7*w = 0 // - 6/49
-3/7*w = -6/49 // : -3/7
w = -6/49/(-3/7)
w = 2/7
w = 2/7
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