№3. Решите уравнение: 1) x + 19 = 83; 2) 91 − x = 15; 3) 8 · x = 432; 4) x : 14 = 6.

1. x + 19 = 83
   x = 83 − 19
   x = 64.
2. 91 − x = 15
   x = 91 − 15
   x = 76.
3. 8 · x = 432
   x = 432 : 8
   x = 54.
4. x : 14 = 6
   x = 6 · 14
   x = 84.

Ответ: 1) x = 64; 2) x = 76; 3) x = 54; 4) x = 84.