14m^2 n^3 + 6 m^3 n^3 + 3m^2 n^3 =

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11a^2b+8c

To simplify the given expression, you can combine the like terms by adding or subtracting their coefficients. In this case, the like terms have the same variables raised to the same powers.

The given expression is:
14m^2 n^3 + 6 m^3 n^3 + 3m^2 n^3

First, let's look at the terms that have m^2 n^3:
14m^2 n^3 + 3m^2 n^3

Since these terms have the same variables and same exponents, you can add their coefficients:
14m^2 n^3 + 3m^2 n^3 = (14+3) m^2 n^3 = 17m^2 n^3

Now, let's look at the term that has m^3 n^3:
6 m^3 n^3

Since there are no other terms with the same variables and exponents, you don't need to combine anything with it.

Therefore, the simplified expression is:
17m^2 n^3 + 6 m^3 n^3