Giúp mình với mọi người

`a, 4x - 69:32 = 17`

`=> 4x - 3 = 17`

`=> 4x = 17+3`

`=> 4x = 20`

`=> x = 20 : 4`

`=> x = 5`

`b, 123 - 5.(2x +3) = 3.4^2`

`=> 123 - 10x - 15 = 48`

`=> 10x - 15 = 123 - 48`

`=> 10x - 15 = 75`

`=> 10x = 75 + 15`

`=> 10x = 90`

`=> x = 90 : 10`

`=> x = 9`

`c, 20.(x-16)- 11 = 29`

`=>20.(x-16) = 29+ 11`

`=> 20.(x - 16) = 40`

`=> x - 16 = 40 : 20`

`=> x - 16 = 2`

`=> x = 2 + 16`

`=> x = 18`

`d, 65 - 4^x = 2020^0`

`=> 65 - 4^x = 1`

`=> 4^x = 65 - 1`

`=> 4^x = 64`

`=> 4^x = 4^3`

`=> x = 3`