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b in (-oo:+oo)
3*b+3/8 = 99/40 // - 99/40
3*b+3/8-(99/40) = 0
3*b+3/8-99/40 = 0
3*b-21/10 = 0 // + 21/10
3*b = 21/10 // : 3
b = 21/10/3
b = 7/10
b = 7/10
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