Question 739116

{{{(5/2)a-(a+4)=a+10}}}

{{{(5/2)a-a-4=a+10}}}

{{{(5/2)a=a+a+4+10}}}

{{{(5/2)a=2a+14}}}

{{{2(5/2)a=2*2a+2*14}}}

{{{cross(2)(5/cross(2))a=4a+28}}}

{{{5a=4a+28}}}

{{{5a-4a=28}}}

{{{a=28}}}