1) 5 + 6x + (3y -6x - 8) = 5 + 6x - 3y + 6x +8 = 13 + 12x - 3y
2) 2u-5w-(7-u+w) = 2u-5w-7+u-w = 3u - 6w - 7
3) -2c+4-(3c-2d)-(5d-2) = -2c + 4-3c+2d-5d+2 = 6 - 5c - 3d
4) 2a+(4a-3b+5c) + (5c-2b) = 2a + 4a - 3b + 5c + 5c - 2b = 6a - 5b + 10c
5) (3x-y)-(-3+2x-y) = 3x-y+3-2x+y = 3y + 3
