9^2*9^(5x) = (9/5)*5^(2+5x) 81*9^(5x) = 9/5*25*5^(5x) 81*9^(5x) = 9*5*5^(5x) 9*9^(5x) = 5*5^(5x) (9/5)^(5x) = 5/9 = (9/5)^(-1) 5x = -1 x = -1/5