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w in (-oo:+oo)
6/14 = w/49 // - w/49
6/14-(w/49) = 0
3/7-1/49*w = 0 // - 3/7
-1/49*w = -3/7 // : -1/49
w = -3/7/(-1/49)
w = 21
w = 21
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