subtract (2a-3b+4c)from the sum of (a+3b-4c),(4a-b+9c)and (-2b+3c-a)
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(a+3b-4c) + (4a-b+9c) + (-2b+3c-a)
(a+4a-a) + (3b-b-2b) + (-4c+9c+3c)
4a + 8c
(4a+8c) - (2a-3b+4c)
4a+8c - 2a+3b-4c
(4a-2a) + (8c-4c) + 3b
2a + 4c +3b
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