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If you can do addition of two textfields then there is no any difficulty for adding more than 2 variables value.
Please have a deep through this post
how to multiply two @fxml TextFields in javafx 2.2 fxml application
how to use DoubleBinding to multiply two TextFields in javafx fxml appl
There is the answer already. Just make one sum variable with DoubleProperty and calculate your textfield variable and set its value to sum variable.