Уравнение 64+d=82 скажуте мне продолжение

1. I`m not tired. 2. This case isn`t very heavy. 3. These cases aren`t very heavy. 4. The dog isn`t asleep. 5. Look! There isn`t Carol.

64+d=8282-64=1864+18=82  d=18

d = 82 - 6482 - 64 = 18d = 18