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The phrase "complex to solve" is correct and usable in written English.
You can use it when referring to a problem or issue that is difficult to solve. For example, "This math problem is very complex to solve."
Exact(31)
After all, social problems are amorphous and complex; to solve them requires an innovative temperament, and that is not common among bureaucrats.
Integer optimization problems are very complex to solve, though.
Such problems are often very computationally complex to solve.
The equations are simply too complex to solve on paper, they say.
Sometimes, problems aren't actually too complex to solve, but rather too boring.
We also consider two extended versions of two theoretical models that are quite complex to solve.
Similar(28)
Theirs is a complex product to solve a complex problem".
RAND had some complex problems to solve.
It's a huge, complex thing to solve.
It's a bit like having several complex puzzles to solve with several clever people available.
All of the groups had come up with really interesting and complex problems to solve.
More suggestions(17)
complex to lay
complex to address
intractable to solve
complex to remedy
knotty to solve
complex to troubleshoot
tricky to solve
complex to settle
complex to be resolved
complicate to solve
compound to solve
tower to solve
difficult to settle
complex to administer
challenging to solve
complex to apply
complex to tackle
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com