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This is supposed to be the correct answer to one of the exercises from a B2 textbook written by a non-native author.

It struck me as odd, but my teacher (also a non-native speaker) told me that such constructions are acceptable in formal written English. Is she right?

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Like user321630's answer I would also regard this as wrong, probably suggesting:

We see this problem to be unsolvable.

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If I were to see this in a student's work I would most likely mark it wrong or suggest a change like:

We see this as an unsolvable problem.

It's current construction feels unfinished or as if there were typos.

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    Or, possibly, "We see this problem to be unsolvable." – TripeHound Nov 1 '18 at 15:22
  • Please add that as an answer. It keeps with the infinitive tag that was put on the post and it is a good answer. – user321630 Nov 1 '18 at 15:57

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