As the Power Fx language used in Power Apps and Power Automate is based on Microsoft Excel, all I can suggest is that you try the Excel Formula Beautifier site Online Excel Formula Beautifier:
if(or(empty(triggerOutputs()?['body/LatLong']), equals(triggerOutputs()?['body/LatLong'], ',')),'25.35342762,55.43085479',triggerOutputs()?['body/LatLong'])

Just remove the equals sign from the Beautifier then paste into Power Automate.
Ellis
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