To find the length of side $DE$ in this triangle, let's analyze the information given.

1. The triangle $DEF$ appears to have an isosceles configuration, where $DE = DF$.
2. The expression for $DF$ is given as $3x - 3$.
3. The expression for $EF$ is $5x - 11$.

Since $DE = DF$, we can set up the following equation:

$DE = DF \Rightarrow DE = 3x - 3$

Without any additional information about $x$, we would typically need to know if there's a relationship between $x$ and another measure to solve for $x$. In some cases, a triangle constraint (like the triangle inequality or angle relationships) may be applied, but here it seems we directly need $x$ to find $DE$.

If you have additional context or further values that may relate to $x$, please share. Otherwise, this setup concludes that the length of side $DE$ depends on solving for $x$ based on further context.

Would you like more details on how to set up equations with additional conditions?

Here are some relative questions to explore further:

1. How do we solve for $x$ if given additional angle or side information?
2. What are the properties of an isosceles triangle, and how can they help solve for side lengths?
3. How can we use the triangle inequality to verify possible side lengths?
4. What if $EF$ had an expression similar to $DE$; how would that affect the solution?
5. Are there any specific techniques to isolate variables in algebraic expressions involving triangles?

Tip: Always double-check if a triangle is isosceles by confirming equal side or angle properties, which can simplify calculations.