[ x-6]2=9 => [ x-6] = `9/2` => x-6 = `9/2` hoặc `-9/2` => x = `21/2` hoặc `3/2`
5 x-1=25 => 5x = 26 => x = `26/5`
`2^(2x+3)`=32 => `2^(2x+3)`=`2^5` => 2x+3 = 5 => 2x = 2 => x = 1
`3^(2 x-1)` =243 => `3^(2 x-1)` = `3^5` => 2 x-1 = 5 => 2x = 6 => x = 3
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