hard to solve
Este problema es muy difícil de resolver para mí.
This problem is very difficult for me to solve.
Este problema es difícil de resolver.
This problem is difficult to solve.
Descubrí que ese problema era difícil de resolver para ella.
I discovered that this problem was difficult for her to solve.
Ese es un problema difícil de resolver.
That’s a difficult problem to solve.
El problema es demasiado difícil de resolver.
The problem is too difficult to solve.
Eso sí que es un problema difícil de resolver.
That is a difficult problem to solve.
Es un problema verdaderamente difícil de resolver.
It's a truly difficult problem to solve.