Как решить помогите подтолкнуть

Решите задачу:

$3^x \leq 81\\3^x \leq 3^4\\3\ \textgreater \ 1\\x \leq 4\\x\in(-\infty;4]\\\\(1/3)^x\ \textgreater \ 1/27\\(13)^x\ \textgreater \ (1/3)^3\\0\ \textless \ 1/3\ \textless \ 1\\x\ \textless \ 3\\x\in(-\infty;3)\\\\5^x\ \textgreater \ 125\\5^x\ \textgreater \ 5^3\\5\ \textgreater \ 1\\x\ \textgreater \ 3\\x\in(3;+\infty)\\\\(0,2)^x \leq 0,04\\(0,2)^x \leq (0,2)^2$
$0\ \textless \ 0,2\ \textless \ 1\\x \geq 2\\x\in[2;+\infty)$