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w in (-oo:+oo)
1/9-7*w = 7*w+91/9 // - 7*w+91/9
1/9-7*w-(7*w)-(91/9) = 0
1/9-7*w-7*w-91/9 = 0
-14*w-10 = 0 // + 10
-14*w = 10 // : -14
w = 10/(-14)
w = -5/7
w = -5/7
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