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1 Answer

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3c-9d+7c+5d=10c-4d
Steps
3c-9d+7c+5d
Group like terms
+3c+7c-9d+5d
Add similar elements: 3c+7c=10c
+10c-9d+5d
Add similar elements: -9d+5d=-4d
Answer= 10c-4d
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