\[2c(3c - 7) - (c - 1)(c + 4) = 6c^2 - 14c - (c^2 + 4c - c - 4)\]
\[= 6c^2 - 14c - c^2 - 4c + c + 4\]
\[= (6c^2 - c^2) + (-14c - 4c + c) + 4\]
\[= 5c^2 - 17c + 4\]
Ответ: 5c² - 17c + 4