Factor completely.

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To factor the expression completely, we first notice that each term is divisible by 14, the greatest common divisor. Factoring that out gives us:

Next, we need to factor the quadratic expression . Looking for two numbers that multiply to and add up to 12, we find 5 and 7. We can rewrite the expression as:

Now, we can group the terms:

Factoring by grouping, we get:

Now, we can factor out the common term :

Putting it all together, the complete factorization of the original expression is: