`( 9x - 2^3 ) : 5 = 2`
`=> 9x - 8 = 5 . 2`
`=> 9x - 8 = 10`
`=> 9x = 10 + 8`
`=> 9x = 18`
`=> x = 2`
`[3^4 -( 8 ^2 + 14 ) : 13]x = 5^3 + 10^2`
`=> [81 - ( 64 + 14 ) : 13]x = 125 + 100`
`=> [ 81 - 78 : 13 ]x = 225`
`=> [ 81 - 6 ] x = 225`
`=> 78x = 225`
`=> x= 3`