Translate the following English sentence to French:
"It is therefore crucial for solutions to be worked out in the affected regions themselves, and on the basic principle that frontier workers must pay tax in the country in which they enjoy their benefits financed through tax."
Il est donc primordial que les solutions soient trouvées dans les régions concernées elles-mêmes, en partant du principe que les transfrontaliers doivent s' acquitter de l' impôt là où ils bénéficient d' avantages financés par celui-ci.