Question 313485
Are you looking for x?

If so, 434 = 7^3.

7^(4x - 13) = 7^(3)

Since we now have the same base 7 on both sides, bring down and equate all exponents.

4x - 13 = 3

4x = 3 + 13

4x = 16

x = 16/4

x = 4

Is this what you need?