9^x-1 = (⅓)^4x-1 Tolong lengkap, kalau pakai foto yang jelas

9^(x-1) = (⅓)^(4x-1)
(3²)^(x-1) = (3^-1)^(4x-1)
3^2(x-1) = 3^-1(4x-1)
2(x - 1) = -1(4x - 1)
2x - 2 = -4x + 1
2x + 4x = 2 + 1
6x = 3
x = 3/6
x = ½