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SebastianG · Answer 1 · 2020-05-14T17:38:30+0000

Answer:

10c-4d

Explanation:

The given expression is
3c-9d+7c+5d

First of all we make groups of like terms as shown below.

(3c+7c)+(-9d+5d)

Now, we combine the like terms.

(3+7)c+(-9+5)d

On simplifying, we get

10c-4d

Therefore, the simplified expression is
10c-4d