To find an equation equivalent to \( w = x + y - z \), we can manipulate the original equation.
Starting from: \[ w = x + y - z \]
We can rearrange it to solve for \( z \): \[ z = x + y - w \]
Thus, the equation that is equivalent is: \[ z = x + y - w \]
So the correct response is: z = x + y - w.