Solving differential equations with constants via laplace transform method

[Aleksandr94]

How can I solve differential equation with constant inside using laplace transform method via ph prime v2.
Say I want to solve y''(x)=y(x)/t.
So I tried to do following with no success. I entered laplace(y''-y/t, x, s). Than I tried to do ilaplace([result from previous action],s,x). I have obtained something that is not right solution.
Is it possible to solve differential equations with constants inside using laplace transform via hp prime v2 at all?