Subtract.
20
−12
 


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Answer:

8

Step by Step Explanation:
  1. In order to subtract 12 from 20, let us count back 12 digits from 20.

    20
    -1
    19
    -1
    18
    -1
    17
    -1
    16
    -1
    15
    -1
    14
    -1
    13
    -1
    12
    -1
    11
    -1
    10
    -1
    9
    -1
    8

  2. We see that by subtracting 12 from 20 we get 8.
    So,
    20
    −12
    8

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