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b in (-oo:+oo)
(2/3)*b+1 = 19/3 // - 19/3
(2/3)*b-(19/3)+1 = 0
(2/3)*b-19/3+1 = 0
2/3*b-16/3 = 0 // + 16/3
2/3*b = 16/3 // : 2/3
b = 16/3/2/3
b = 8
b = 8
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