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w in (-oo:+oo)
(2/3)*w+1/2 = 31/30 // - 31/30
(2/3)*w+1/2-(31/30) = 0
(2/3)*w+1/2-31/30 = 0
2/3*w-8/15 = 0 // + 8/15
2/3*w = 8/15 // : 2/3
w = 8/15/2/3
w = 4/5
w = 4/5
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