To find the value of \( z \) that makes the equation \( z + 905 = 905 + 696 \) true, we can simplify the right side of the equation first.
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Calculate \( 905 + 696 \): \[ 905 + 696 = 1601 \]
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Now, the equation becomes: \[ z + 905 = 1601 \]
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To isolate \( z \), subtract 905 from both sides: \[ z = 1601 - 905 \]
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Now, perform the subtraction: \[ z = 696 \]
Thus, the value of \( z \) that makes the addition sentence true is: \[ \boxed{696} \]