Math question

Question

1/4 + 1/5 = x/2

 

help please i got 9/10 but dont know if its correct or how can it confirm it in case it is

Answer 1

1/4 + 1/5 = x/ 2

5/20 + 4/20 = x/2         LCD

9/20 = x/2                   combine

18/20 = x                    multiply both sides by 2

9/10 = x                     reduce