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x <- c("This (is solved", "This is (fine)", "This is the problem)")
gsub("(\\([^()]*\\))|[()]", "\\1", x)

Success #stdin #stdout 0.26s 38380KB

stdin

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Standard input is empty

stdout

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[1] "This is solved"      "This is (fine)"      "This is the problem"

https://ideone.com/JpJyX8

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R (R 3.5.2)

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