(1/3)^x-9=1/81 Решить уравнение

Question

(1/3)^x-9=1/81
Решить уравнение

Answer 1

(1/3)^x-9=(1/3)^4
x-9=4
x=13

Answer 2

( 1/3 ) ^ X - 9 = 1/81
( 1/3 ) ^ X - 9 = ( 1/3 ) ^ 4
X - 9 = 4
X = 13