Simple property formatting
My VB.NET is incredibly rusty but you should write a separate function:

Public Shared Sub ReplaceBracketsWithParentheses(ByRef text As String)
    text = Replace(Replace(text, "[", "("), "]", ")")
End Sub


Calling code will then simply be:

Public Sub removeBadBrackets()
    ReplaceBracketsWithParentheses(ValueCalc)
    ...
End Sub 


Note that if you have to replace more than few substrings then a fluid approach may be more readable:

Public Shared Sub ReplaceBracketsWithParentheses(ByRef text As String)
    text = text.Replace("[", "(") _
               .Replace("]", ")") _
               .Replace("{", "(") _
               .Replace("}", "]")
End Sub




If you're translating some sort of mathematical expressions (but not only!) you may also consider to use a Regex.

One word about naming: I don't know the domain you're using this code but to me LLLCalc, LLCalc and so on are not descriptive names (and, anyway, acronyms should be cased PascalCase like LllCalc, the same is true for removeBadBrackets()).