First lets make z = 5^(x-5)
Then we can change this to
2z - 6z/5 = 25
multiply both sides by 5 and get
10z - 6z = 125
4z = 125
z = 125/4
So
5^(x-5) = 125/4 take log base 5 of both sides and get
(x - 5) = log(5) (125/4)
x = log(5) (125/4) + 5 = 7.138647

Answer #1| 30/12 2013 06:15100 %