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w in (-oo:+oo)
95/21 = (-6/7)*w+6*w+2/3 // - (-6/7)*w+6*w+2/3
95/21-((-6/7)*w)-(6*w)-(2/3) = 0
(6/7)*w-6*w+95/21-2/3 = 0
27/7-36/7*w = 0 // - 27/7
-36/7*w = -27/7 // : -36/7
w = -27/7/(-36/7)
w = 3/4
w = 3/4
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