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w in (-oo:+oo)
(2/7)*w-(7*w)+1 = 143/49 // - 143/49
(2/7)*w-(7*w)-(143/49)+1 = 0
(2/7)*w-7*w-143/49+1 = 0
-47/7*w-94/49 = 0 // + 94/49
-47/7*w = 94/49 // : -47/7
w = 94/49/(-47/7)
w = -2/7
w = -2/7
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