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w in (-oo:+oo)
(3/7)*w-(4*w)+6 = 194/49 // - 194/49
(3/7)*w-(4*w)-(194/49)+6 = 0
(3/7)*w-4*w-194/49+6 = 0
100/49-25/7*w = 0 // - 100/49
-25/7*w = -100/49 // : -25/7
w = -100/49/(-25/7)
w = 4/7
w = 4/7
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