"A închide și a deschide nu este greu."

Translation: To close and to open is not hard.

[JohnAllman4]

That is a literal translation, but in English, we would say, "to close and to open aren't hard", not that they "is not" hard. To close, on its own, is not hard. To open, on its own, is not hard. To close and to open (two infinitives), together, are plural, so, together, they aren't hard, rather than they "isn't" hard. Neither is hard, so both aren't hard.

[patrik_594]

No need for the second to

[Hector290697]

I hear "neste" instead of "nu este". Contraction maybe?

[Cris_Nico]

In English we would invariably say open and close not close and open unless we really wanted to emphasise a point.