what should be added to 4a+7b-3c to obtain 3a-4b+6c
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Answer:
Let the number be x
4a + 7b - 3c + x = 3a - 4b + 6c
x = 3a - 4a - 4b - 7b + 6c + 3c
x = 9c - 11b - a
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