3 pangkat 2x dikali 9 pangkat 4x - 2 = 27 pangkat x -4

3^(2x) . 9^(4x-2) = 27^(x-4)
3^(2x) . (3²)^(4x - 2) = (3³)^(x-4)
3^(2x) . 3^(8x - 4) = 3^(3x - 12)
2x + 8x - 4 = 3x - 12
10x - 3x = -8
7x = -8
x = -8/7