Total Questions: 50
y + 2x - [y - (y - x + y) - (x + y) + y] - 2y
(a - 2b) (b - 3a) + (a + b) (a -3b) - (b - 3a) (4a - 5b)
(4x + 1)² - (4x + 3) (4x - 1)