сводить(что-либо) к (чем-либо; путём упрощения; boil something down to something; The CEO was able to boil down the argument to discussion about the rate of his employees' wages. – Директор смог свести спор к обсуждению размера зарплаты его работников. TarasZ)
суть аргумента(And this is what the argument boils down to: It's the suspicion that not being on Facebook, which has become so normal among young adults, is a sign that you're abnormal and dysfunctional, or even dangerous." (The Province) ART Vancouver)