1. a) 4x
b) 6x + 4
c) 6a - 2b - 7
2. b
3. a
5. a) 2x - 4 + 3x + 6 = 5x +2
b) 5x - 3y + 1 + 4x + 6y - 3 = 9x + 3y - 2
c) 2x - 2y + 3 - 7x + y - 4 - 4y + x - 5 = - 4x - 5y - 6
6. d
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1. a) 4x
b) 6x + 4
c) 6a - 2b - 7
2. b
3. a
5. a) 2x - 4 + 3x + 6 = 5x +2
b) 5x - 3y + 1 + 4x + 6y - 3 = 9x + 3y - 2
c) 2x - 2y + 3 - 7x + y - 4 - 4y + x - 5 = - 4x - 5y - 6
6. d