When multiplying exponents with same base you can add the exponents: $etxtx^2$
$ex^{3}t\cdot t-2x-3$
2
When multiplying two powers that have the same base ($t$), you can add the exponents
$et^2x^{3}-2x-3$
Final answer to the problem
$et^2x^{3}-2x-3$
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