Subtract a+3b+4c from the sum of 3a + 2b +4c and 9a -b+3c
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Step-by-step explanation:
(3a+2b+4c)+(9a-b+3c)-(a+3b+4c)
(12a+b+7c)-(a+3b+4c)
11a-2b+3c
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