I've done this before but I really do not remember. Sorry
Answer
The answer and procedures of the exercise are attached in the following archives.
Step-by-step explanation:
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.
Answer:
x+9
Step-by-step explanation:
if you expand...you could get x+9, which is the same as the given expression
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