Question 477918
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Hi,
{{{sum( (2k-10), k = 1, 22 )}}}
 -8 + -6 + -4 + -2 + 0 + 2 + 4 + 6 + 8
 10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34