Final answer:
The expression 15x-14 does not have common factors other than 1 and thus is already in its simplest form, meaning it cannot be factored further.
Step-by-step explanation:
The expression 15x-14 is a linear expression and not a quadratic equation, so it cannot be factored in the same way that a quadratic expression might be. To factor this expression, you would look for a common factor between the two terms. In this case, there are no common factors other than 1, so the expression is already in its simplest form and cannot be factored further.