Question 991525
I'll do one and you can do the rest the same way.
Look at factors of 10 and calculate the sum.
{{{10}}},{{{1}}}={{{11}}}
{{{5}}},{{{2}}} ={{{7}}}
{{{-2}}},{{{-5}}}={{{-7}}}
{{{-10}}},{{{-1}}}={{{-11}}}
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({{{-2}}},{{{-5}}})