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b in (-oo:+oo)
(5/6)*b-b+1/2 = 2/5 // - 2/5
(5/6)*b-b+1/2-(2/5) = 0
(5/6)*b-b+1/2-2/5 = 0
1/10-1/6*b = 0 // - 1/10
-1/6*b = -1/10 // : -1/6
b = -1/10/(-1/6)
b = 3/5
b = 3/5
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