from the sum of 3a-5b+3c and 2a+4b-5c subtract 4a-b-c+3
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Answer:
3a-5b+3c
+2a+4b-5c
───────
5a-b-2c
now subtract 4a-b-c+3
5a-b-2c
- 4a-b-c+3
══════
a-2b-3c+3
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