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w in (-oo:+oo)
1/3 = (6/7)*w-(18/3) // - (6/7)*w-(18/3)
1/3-((6/7)*w)+18/3 = 0
(-6/7)*w+1/3+18/3 = 0
19/3-6/7*w = 0 // - 19/3
-6/7*w = -19/3 // : -6/7
w = -19/3/(-6/7)
w = 133/18
w = 133/18
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