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b in (-oo:+oo)
3*b+4*b+3/5 = 388/5 // - 388/5
3*b+4*b+3/5-(388/5) = 0
3*b+4*b+3/5-388/5 = 0
7*b-77 = 0 // + 77
7*b = 77 // : 7
b = 77/7
b = 11
b = 11
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