1) x + 2x - 5 = 403x - 5 = 403x = 45x = 15
2) x + (4 + x) + x = 163x + 4 = 163x = 12x = 4
Ответ: x = 15 и x = 4.
1) x + 2x - 5 = 40
3x - 5 = 40
3x = 45
x = 15
2) x + (4 + x) + x = 16
3x + 4 = 16
3x = 12
x = 4
Ответ: x = 15 и x = 4.