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30 January, 08:09

3 - (-18)

1.-21

2.-15

3.15

4.21

+4
Answers (1)
  1. 30 January, 08:16
    0
    Use KCC (keep, change, change)

    keep the 3

    change the - to +

    and change the - 18 to 18

    so its 3+18=21
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