Log по основанию 9x-log по основанию27x=2/3
Log₉x - log₂₇x = 2/3 1/2*log₃x -1/3*log₃x = 2/3 | *6 3log₃x - 3log₃x = 4 log₃x = 4 x = 3⁴ = 81 x = 81