Answer
$= -13$
Work Step by Step
1. We substitute the $x, y, and \space z$ values into the equation using parenthesis:
$x + y - z$ for $x = -18$, $y = 13$, $z = 8$
$= (-18) + (13) - 8$
$= - 18 + 13 - 8$
$= -26 + 13$
$= -13$
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