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2014-07-13T20:45:15+08:00

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Since it is just arithmetic...you solve it as how it was stated. 
16-4=12+8=20
the answer is 20..
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2014-07-13T20:51:48+08:00

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This is equal to 20.

This expression is also equal to 16 + (-4) + 8 

If you add all the positives first, it results to 24 + (-4)

Subtract 4 from 24, 24 - 4 = 20
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