1
(-2x + 3y) + (9x -7y)
11x + 10y
7x - 4y
2
(x + 1) + (3x^2 + 4x -9)
3x^2 + 5x - 8
3x^2 + 5x - 10
3
(3m -7) + (5m + 2) + (-6m + 4)
2m + 9
2m - 1
4
(-6x + 10y) + (-3x - 2y)
-3x + 8y
-9x + 8y
5
(5x - 4y + 3z) - (3x - 2y - z)
2x - 2y + 2z
8x - 6y + 2z
