1x + 1x + 4 + (x + 4) x 2 = 402x + 4 + 2(x + 4) = 402x + 4 + 2x + 8 = 404x + 12 = 404x = 28x = 7
Ответ: x = 7.
1x + 1x + 4 + (x + 4) x 2 = 40
2x + 4 + 2(x + 4) = 40
2x + 4 + 2x + 8 = 40
4x + 12 = 40
4x = 28
x = 7
Ответ: x = 7.