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