how to evaluate the expression 4 + (6-2)

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please explain it to me

May 7th, 2015

Suppose you have 6 pens and your friend takes from you 2 pens, this is what's expressed by (6-2), how many pens do you still have. The answer is 4 and 6-2=4 

Then someone gives you 4 other pens, you will have 4 + 4 = 8 pens. 

May 7th, 2015

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May 7th, 2015
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May 7th, 2015
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