3a+4b-7c , 5a+3b-6c , 4a+2b-4c
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Step-by-step explanation:
3a +4b -7c + 5a + 3b - 6c + 4a + 2b - 4c
3a + 5a + 4a + 4b + 3b + 2b -7c - 6c - 4c
+12a +9b -12c - 4c
+12a +9b -16c
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