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