The sum of the expression is 11c - 9d - 3
To solve the given expression, we are going to open the brackets and rearrange the variables based on their like terms.
By opening the brackets, we have:
= 9c - 8d + 2c - 6 - d + 3
By rearrangement, we have:
= 9c + 2c - 8d - d - 6 + 3
= 11c - 9d - 3
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