a,
`16x + 40 = 10 . 3^2 + 5. (1+2+3)`
`=>16x + 40 = 10 . 9 + 5 .6`
`=>16x + 40 = 90 + 30`
`=>16x + 40 = 120`
`=> 16x = 120 - 40`
`=> 16x = 80`
`=> x = 80 : 16`
`=> x = 5`
b,
`92 -2x = 2 . 4^2 - 3.4 + 120 : 5`
`=> 92 - 2x = 2 . 16 - 12 + 24`
`=> 92 - 2x = 32 - 12 + 24`
`=>92 - 2x = 44`
`=> 2x = 92 - 44`
`=> 2x = 48`
`=> x = 48 : 2`
`=> x =24`
~~~~~~~~GOOD LUCK~~~~~~~~