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= 7a + 14b-21c-6a+9b+6c
= 7a-6a+14b+9b-21c+6c
= a + 23b - 15c
2. 6a²-10a+2-8a²+24a+40
= 6a²-8a²-10a+24a+2+40
= -2a²+14a+42