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w in (-oo:+oo)
3/10-7*w = (-3/7)*w-(393/70) // - (-3/7)*w-(393/70)
3/10-7*w-((-3/7)*w)+393/70 = 0
(3/7)*w-7*w+3/10+393/70 = 0
207/35-46/7*w = 0 // - 207/35
-46/7*w = -207/35 // : -46/7
w = -207/35/(-46/7)
w = 9/10
w = 9/10
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