To combine like terms in the expression \( 46pq^2 + 39p^3q^2 - 39p^3q^2 \), we can see that the terms \( 39p^3q^2 \) and \( -39p^3q^2 \) are like terms.
Here’s the simplification step:
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Combine the like terms: \[ 39p^3q^2 - 39p^3q^2 = 0 \]
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Now, substitute back into the original expression: \[ 46pq^2 + 0 = 46pq^2 \]
Thus, the simplified expression is: \[ \boxed{46pq^2} \]