To evaluate the expression \( x(-y + z) \) for the given values \( x = 3 \), \( y = 3 \), and \( z = 1 \), we can substitute the values into the expression.
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Substitute the values: \[ x(-y + z) = 3(-3 + 1) \]
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Calculate inside the parentheses: \[ -3 + 1 = -2 \]
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Now, substitute back: \[ 3(-2) = -6 \]
Therefore, the result of the evaluation is \( \boxed{-6} \).