Math and Arithmetic

What is 10 plus 9 plus 1 minus 1 plus 2 minus 2 plus 3 minus 1 plus 4 minus 4?

012

21

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It is 21.

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2017-05-25 09:58:40

(10+9)+(1โ1)+(2โ2)+(3โ1)+(4โ4) = 21

This is the same equation rewritten: (10+9)+(3โ1) = 21
This can be done as 1-1, 2-2, 4-4 cancel themselves out.

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