Subtract 2a-5b+2c-9 from 3a-4b-c+6

3a - 4b - c + 6 - ( 2a - 5b + 2c -9)
3a - 4b - c + 6 - 2a + 5b - 2c +9 
3a - 2a - 4b + 5b - c - 2c + 6 + 9
a + b - 3c + 15

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