<span>Система.</span>
<span>{A+100=2(B-100) </span><span>{6(A-10)=B+10 </span>Выражаем А<span>А=2В-300 </span>Тогда<span>6(2в-300)-60=В+10 </span><span>12в-1800-60=В=10 </span><span>11в=1870 </span><span>в=170 </span><span>а=40</span>