7^x+2 - 1/7 7^x+1 - 14 * 7^x-1 + 2 * 7^x=48

Question

7^x+2 - 1/7 7^x+1 - 14 * 7^x-1 + 2 * 7^x=48

Answer 1

7^х • ( 7^2 - 1/7•7 - 14•( 1/7 ) + 2 ) = 48
7^х • ( 49 - 1 - 2 + 2 ) = 48
7^х • 48 = 48
7^х = 1
7^х = 7^0
Х = 0