464) c + 14 * 70 = 3000

Решение:

1. \( c + 14 \cdot 70 = 3000 \)
2. \( 14 \cdot 70 = 980 \)
3. \( c + 980 = 3000 \)
4. \( c = 3000 - 980 \)
5. \( c = 2020 \)

Ответ: c = 2020.