To find the missing number in the equation \( 724 - x = -242 \), we can isolate \( x \) by following these steps:
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Start with the original equation: \[ 724 - x = -242 \]
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Subtract 724 from both sides to isolate the term with \( x \): \[ -x = -242 - 724 \]
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Simplify the right side: \[ -x = -966 \]
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Multiply both sides by -1 to solve for \( x \): \[ x = 966 \]
So, the missing number is \( 966 \).