To find an equivalent equation for \( w = x + y - z \), we can isolate \( z \).
Starting with the original equation:
\[ w = x + y - z \]
Rearranging this equation to solve for \( z \) gives:
\[ z = x + y - w \]
So, the equivalent equation is:
\[ z = x + y - w \]
This answer corresponds to the response:
z equals x plus y minus w.