English Translation
It’s not easy to solve the problem.
Does this sentence lack a subject?
It’s not easy to solve the problem.
Does this sentence lack a subject?
Yes, but that’s how it works.
Look here:
This sentence falls into category #7.
However, you may notice that the article claims that the adjective should be in the partitive.
I asked natives in a chat and they said the sentence is correct, because the word order makes a difference:
With #1, the adjective and the verb form a unit that does not decline.