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b in (-oo:+oo)
(2/3)*b = 8/15 // - 8/15
(2/3)*b-(8/15) = 0
(2/3)*b-8/15 = 0
2/3*b-8/15 = 0 // + 8/15
2/3*b = 8/15 // : 2/3
b = 8/15/2/3
b = 4/5
b = 4/5
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