Answer :

We start with the expression

[tex]$$19x^3 + 8x^3.$$[/tex]

Since both terms have the same variable part [tex]$x^3$[/tex], they are like terms. This means we can add their coefficients together:

[tex]$$19 + 8 = 27.$$[/tex]

Thus, the expression simplifies to

[tex]$$27x^3.$$[/tex]

So, the final answer is [tex]$\boxed{27x^3}$[/tex].

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