Question 1173832
Doug,  {{{1/3}}}
Son, {{{1/n}}}
Doug+Son, {{{1/2}}}


{{{1/3+1/n=1/2}}}

-

{{{1/2-1/3=1/n}}}

{{{3/6-2/6=1/n}}}

{{{1/6=1/n}}}

{{{highlight(n=6)}}}