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To simplify the expression \( 3xy - 2xz + yz + 2xy - 4xz - 5yz \), we will combine like terms.
1. Combine the \( xy \) terms:
\[
3xy + 2xy = 5xy
\]
2. Combine the \( xz \) terms:
\[
-2xz - 4xz = -6xz
\]
3. Combine the \( yz \) terms:
\[
yz - 5yz = -4yz
\]
Now, we put all the combined terms together:
\[
5xy - 6xz - 4yz
\]
Thus, the expression equivalent to \( 3xy - 2xz + yz + 2xy - 4xz - 5yz \) is:
\[
5xy - 6xz - 4yz
\]