1 вариант
405 - (9х + 70) : 4 = 383
- (9х + 70) : 4 = 383 - 405
- (9х + 70) : 4 = -22
- (9х + 70) = -22 * 4
- (9х + 70) = -88
9х + 70 = 88
9x = 88 - 70
9x = 18
x = 18 : 9
x = 2
2 вариант
405 - (9х + 70) : 4 = 383
405 - 383 = (9х + 70) : 4
22 = (9х + 70) : 4
(9х + 70) : 4 = 22
9х + 70 = 22*4
9х + 70 = 88
9x = 88 - 70
9x = 18
x = 18 : 9
x = 2
Ответ: 2