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2a -5b +3c -5a - b +'4c +a + b
2a +a - 5a -5b - b + b + 3c + 4c
3a -5a - 5b + 7c
- 2a - 5b + 7c
(2a - 5b + 3c) - (-5a + b - 4c) - (-a - b) =
2a - 5b + 3c + 5a - b + 4c +a + b =
8a - 5b + 7c