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Mads137
The answer is 6x+7x there is no answer without the value of c
ashlynn11051994

Answer:10x+9

Step-by-step explanation:

First you have to multipy the 3 into the parenthesis using distributive property.

After that you get 3x+9+7x.

Then you get 10x+9 because you can only combine like terms

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