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Mathematics 13 Online
OpenStudy (anonymous):

Take the sum of 2a - 3b - 4c and -4a + 7b - 5c from the sum of 4c - 2b and 5b - 2a - 2c -2a + 3b + 2c - - 2a + 4b - 9c That is all I have done and it is getting confusing!

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