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w in (-oo:+oo)
(1/7)*w+4 = 6*w+99/35 // - 6*w+99/35
(1/7)*w-(6*w)-(99/35)+4 = 0
(1/7)*w-6*w-99/35+4 = 0
41/35-41/7*w = 0 // - 41/35
-41/7*w = -41/35 // : -41/7
w = -41/35/(-41/7)
w = 1/5
w = 1/5
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