$\operatorname{log}_{3}\left(2x − 1\right) = −2$

$5^{\operatorname{log}_{5}} \left(x\right) = 3$

$\operatorname{log}_{2}\left(x\right) − \operatorname{log}_{2}\left(3\right) = 4$

$\operatorname{log}_{3}\left(5\right) = x$