`c. (2x/3 - 3)^3 = -64/27`
`(2x/3 - 3)^3 = (-4/3)^3`
`2x/3 - 3 = -4/3`
`2x/3 = -4/3 + 3`
`2x/3 = 5/3`
`2x : 3 = 5/3`
`2x = 5/3 * 3`
`2x = 5`

`x = 5 : 2`
`x = 5/2`

`e.` $(8x-1)^{2x+1}$ `=` $5^{2x+1}$ 

`8x-1 = 5`

`8x = 5+1`

`8x = 6`

`x = 6 : 8`

`x = 3/4`

`g.` $9^{2x+1}$  `=` `27^3`

$(3^2)^{2x+1}$  `=` `( 3^3 )^3`

$3^{2.(2x+1)}$  `=` $3^{3.3}$

$3^{4x+2}$  `= 3^9`

`4x + 2 = 9`

`4x = 9-2`

`4x = 7`

`x = 7/4`

`@banhbeogacha`