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w in (-oo:+oo)
(1/7)*w+4/5 = 127/140 // - 127/140
(1/7)*w+4/5-(127/140) = 0
(1/7)*w+4/5-127/140 = 0
1/7*w-3/28 = 0 // + 3/28
1/7*w = 3/28 // : 1/7
w = 3/28/1/7
w = 3/4
w = 3/4
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