The simplified form of the expression

The values of the placeholder variables are as follows;
The actual expression in the task content can be further simplified as follows;
(-2jk²/3km⁴)³
= -8j³k⁶/27k³m¹²
= -8j³k³/27m¹².
Hence, by comparison; the values of the variable are as indicated above.
Read more on exponents;
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