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a÷c=3 r1 => a=3c+1
b÷c=4 r1 => b=4c+1
3c+1+4c+1+c=82
8c+2=82/-2
8c=80/÷8
c=10
a=3×10+1=30+1=31
b=4×10+1=40+1=41