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w in (-oo:+oo)
(2/5)*w+w+6 = 157/25 // - 157/25
(2/5)*w+w-(157/25)+6 = 0
(2/5)*w+w-157/25+6 = 0
7/5*w-7/25 = 0 // + 7/25
7/5*w = 7/25 // : 7/5
w = 7/25/7/5
w = 1/5
w = 1/5
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