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6x - 3x
3x
B) 6a + 2b + 4a - b
6a + 4a + 2b - b
10a + b
C) 2x+7y+4y-2z
2x + 11y - 2z
D) 5mn+3m+2n+6m
5mn + 3m + 6m + 2n
5mn + 9m + 2n