Question 744747
{{{sum((2k-10), k=7, 37)}}}

{{{2*sum(k, k=7, 37)-10*sum(1, k=7, 37)}}}

The sums are a little tricky because we are not summing from 1 to a number...

{{{((37)(37+1)+(7-1)(7+1-1))-(10(37-7+1))}}}

{{{1364-310)}}}


or 1054