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b in (-oo:+oo)
(3/5)*b-2/3 = 53/15 // - 53/15
(3/5)*b-2/3-(53/15) = 0
(3/5)*b-2/3-53/15 = 0
3/5*b-21/5 = 0 // + 21/5
3/5*b = 21/5 // : 3/5
b = 21/5/3/5
b = 7
b = 7
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