I need help with the ones withe the little marks by them​

Answer:Representing the situation:9. n + 12n = 9118. n + 10n = 9920. 12n +3 = 13521. 8(n+7) = 10426. 2(n+43) = 9427. 60 + n = 132Solving the equation:9. n + 12n = 91     13n = 91     n = 91/13     n = 718. n + 10n = 99     11n = 99     n = 99/11     n = 920. 12n +3 = 135      12n = 132      n = 132/12      n = 1121. 8(n+7) = 104     8n + 56 = 104     8n = 48     n = 626. 2(n+43) = 94      2n + 86 = 94      2n = 8      n = 427. 60 + n = 132      n = 72