JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Depending on the formula you are using, it should still work regardless of the number of parenthesis.
If you want, you can separate parts of your formula into separate Form Calculation widget, then sum or add them all together.
May we know how your formula works and what form you are working on so that we can help you further?