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w in (-oo:+oo)
27/35 = (-4/7)*w+7*w-(3/10) // - (-4/7)*w+7*w-(3/10)
27/35-((-4/7)*w)-(7*w)+3/10 = 0
(4/7)*w-7*w+27/35+3/10 = 0
15/14-45/7*w = 0 // - 15/14
-45/7*w = -15/14 // : -45/7
w = -15/14/(-45/7)
w = 1/6
w = 1/6
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