3 в степени 2х-1 + 3 в степени 2х-2 - 3 в степени 2х-4 =315

3^{2x-1}+3^{2x-2}-3^{2x-4}=315 3^(2x-1+2x-2-2x+4)=315 3^(2x+1)=315.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................