Question

Answer 1

`1/20 - (x - 8/5) = 1/10`

`=>  x - 8/5 = -1/20`

`=>  x         = -1/20 + 8/5`

`=>  x          = 31/20`

`7,2 : [41 - (2x - 5)] = 2^3 *5`

`=> 7,2 : [41 - (2x - 5)] = 40`

`=>         41 - (2x  - 5) = 0,18`

`=>                    2x - 5 = 40,82`

`=>                     x      = 22,91`

`|5 - 2x| = 4`

TH1:

`5 - 2x = 4`

`=>  2x - 1`

`=>    x = 1/2`

TH2:

`5 - 2x = -4`

`=> 2x = 9 `

`=>x    = 9/2`

`(1/3)^(2x - 1) = 1/243`

`=> (1/3)^(2x - 1) = (1/3)^5`

`=> 2x - 1 = 5`

`=> 2x = 6`

`=>  x = 3`