84a + 25a + 7 = 443109a + 7 = 443109a = 436a = 4
4(9 + 7x) + 21 = 39336 + 28x + 21 = 39328x + 57 = 39328x = 336x = 12
Ответ: a = 4, x = 12
84a + 25a + 7 = 443
109a + 7 = 443
109a = 436
a = 4
4(9 + 7x) + 21 = 393
36 + 28x + 21 = 393
28x + 57 = 393
28x = 336
x = 12
Ответ: a = 4, x = 12