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27/8=a^⁻³
(⅔)⁻³=a⁻³
a=⅔
(⅔)^x=16/81
(⅔)^x=(⅔)⁴
x=4
(⅔)^x<3/2
(⅔)^x<(⅔)⁻¹, a<1, więc zmieniamy znak opuszczając wykładniki
x>-1