Найдите х, если: a) (65+ x): 2 - 21 = 30; б) (x. 58-24) : 2 = 191; в) 8432 - 3870 : x = 8346.

Решим уравнения.

1. a) (65 + x) ∶ 2 – 21 = 30

   (65 + x) ∶ 2 = 30 + 21

   (65 + x) ∶ 2 = 51

   65 + x = 51 × 2

   65 + x = 102

   x = 102 – 65

   x = 37

   Ответ: 37

2. б) (x × 58 – 24) ∶ 2 = 191

   x × 58 – 24 = 191 × 2

   x × 58 – 24 = 382

   x × 58 = 382 + 24

   x × 58 = 406

   x = 406 ∶ 58

   x = 7

   Ответ: 7

3. в) 8432 – 3870 ∶ x = 8346

   3870 ∶ x = 8432 – 8346

   3870 ∶ x = 86

   x = 3870 ∶ 86

   x = 45

   Ответ: 45