2a-4b-5c-6a-3b+2c=-4a-7b-3c
4a-2b+3-3a+6b-9=a+4b-6
7a+3b+4c+5a-2b-8c=12a+b-4c
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4a - 2b + 3 - 3a + 6b - 9 = a + 4b - 6
7a + 3b + 4c + 5a - 2b - 8c = 12a + b - 4c
2a-4b-5c-6a-3b+2c=-4a-7b-3c
4a-2b+3-3a+6b-9=a+4b-6
7a+3b+4c+5a-2b-8c=12a+b-4c