
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You cannot simplify this expression, but instead, you can factor it like this:
Find the Greatest Common Factor (GCF) of the three numbers.

Since the GCF is 2, we can factor 10, 6, and 6 by dividing them by two and placing them inside parenthesis.

When you multiply 2 to each of the terms, you would end up with 10a + 6b + 6c.