Question 83905
{{{5a=a}}}

{{{5a-a=cross(a-a)}}} Subtract a from both sides


{{{4a=0}}} Combine like terms


{{{cross(4/4)a=0/4}}} Divide both sides by 4


So this is our answer


{{{a=0}}}


Check:


{{{5(0)=0}}}  Plug in a=0


{{{0=0}}} works