Quick Math - Subtraction 1

Description

Subtract the numbers as fast as possible. You have only 90 seconds.
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21 - 7 84 - 31 24 - 2 37 - 21 43 - 33 62 - 31 10 - 7 93 - 6 93 - 87 61 - 21 21 - 10 21 - 16 26 - 2 56 - 28
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