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w in (-oo:+oo)
(2/7)*w-6/7 = -6*w-(218/49) // + -6*w-(218/49)
(2/7)*w-(-6*w)-6/7+218/49 = 0
(2/7)*w+6*w-6/7+218/49 = 0
44/7*w+176/49 = 0 // - 176/49
44/7*w = -176/49 // : 44/7
w = -176/49/44/7
w = -4/7
w = -4/7
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