5. Упростите выражение: 1) (3x - 5y - 8v) - (2x + 7y - 3v) + (5v - 11x + y)

(3x - 5y - 8v) - (2x + 7y - 3v) + (5v - 11x + y) = 3x - 5y - 8v - 2x - 7y + 3v + 5v - 11x + y = (3x - 2x - 11x) + (-5y - 7y + y) + (-8v + 3v + 5v) = -10x - 11y + 0v = -10x - 11y