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To solve the equation , we begin by understanding that we need a number which, when subtracted from , produces no change.
Recall the property that any number minus zero results in the original number:
In this problem, if , then:
Therefore, the missing number must be to maintain equality.
Checking the provided options, the correct answer is choice .
Thus, the solution to the problem is .
0
\( 20:1= \)
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