3a+2b+c 5 2a+b-3c 1, 2a 4b 3a 6c 1c b, 3a 2b a+3b/3a+b, 3a +2b -c 2a +3b +c, 3a + 5b - 2a + 6b, 2a+b-3c 2a-b+3c, a 2b 3a 2 + 4ab 2, 2a+3b+c 0 a b c, 2a 3 2b 6 2c 12, a 3 b 3 c 3-3abc, 3a 2-5ab-2b 2+4a-b+1, 2a+b 2a-3b -3a 2a+b, b 2-3ac, a/3 b/5 c/7 3a+2b-4c 9, 2a+3b 5ab, 3a+2b 5ab, 3a-b+2 3a-b-2, 2a+b+2 3ab, 2a-3b -1, a 3+3a 2b+3ab 2+b 3-8, 3a+2b+c
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