a:b=7 rest 9, a=7b+9
a+b=105
7b+9+b=105, 7b+b=105-9, 8b=96, b=96:8, b=12
a+12=105, a=105-12, a=93
a=93, b=12
verificare: 93+12=105, 93:12=7 rest9
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