Question 984699
Denominators are these:
2a, 2, 5, 3*5.


Simplest common denonimator must use each of the factors to the greatest exponent that it occurs in any of the listed denominators....  which means, {{{2*a*3*5=highlight_green(2*3*5*a)}}}.


Multiply left and right sides by  {{{2*3*5*a}}}, and then simplify and solve.