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w in (-oo:+oo)
38/77 = (-2/7)*w-(4*w)+4 // - (-2/7)*w-(4*w)+4
4*w-((-2/7)*w)+38/77-4 = 0
(2/7)*w+4*w+38/77-4 = 0
30/7*w-270/77 = 0 // + 270/77
30/7*w = 270/77 // : 30/7
w = 270/77/30/7
w = 9/11
w = 9/11
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