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b in (-oo:+oo)
(2/3)*b+1/4 = (5/8)*b+1/2 // - (5/8)*b+1/2
(2/3)*b-((5/8)*b)+1/4-(1/2) = 0
(2/3)*b+(-5/8)*b+1/4-1/2 = 0
1/24*b-1/4 = 0 // + 1/4
1/24*b = 1/4 // : 1/24
b = 1/4/1/24
b = 6
b = 6
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