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(-2011) + (-2009) + (-2007) + ... + 2007 + 2009 + 2011 + 2013 + 2015 + 2017
perhatikan bahwa :
-2011 + 2011 = 0
-2009 + 2009 = 0
-2007 + 2007 = 0
.
.
.
sehingga yang tersisa adalah
2013 + 2015 + 2017 = 6045 jawab : D