Answer:

Explanation:
Equation given:
10/3 × 3^x -3^(x-1) = 81
Finding the value of x :

- (We took 3^x-1 as 3^x/3 because according law x^m-n = x^m/x^n)


Taking 3x common,we get:





Since according to the law of exponents,if the bases are equal then the powers are equal too.

Hence,the value of x is 3.