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w in (-oo:+oo)
(1/3)*w-1 = (6/7)*w-(22/21) // - (6/7)*w-(22/21)
(1/3)*w-((6/7)*w)+22/21-1 = 0
(1/3)*w+(-6/7)*w+22/21-1 = 0
1/21-11/21*w = 0 // - 1/21
-11/21*w = -1/21 // : -11/21
w = -1/21/(-11/21)
w = 1/11
w = 1/11
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