Giúp bài 7 với ạ.Em cần gấp ạ

`1)2x - 1 = 5`

`2x = 5 + 1 `

`2x = 6 `

`x = 6 : 2`

`x = 3 `

`2) -3x - 4 = -(-6) `

` -3x - 4 = 6 `

`-3x = 6 + 4 `

`-3x = 10 `

`x = 10 : (-3)`

`x = -10/3 `

`3) 71 - (33 + x) = 26 `

`71 - 33 - x = 26 `

`38 - x = 26 `

`x = 38 - 26 `

`x = 12 `

`4) (x + 73) - 26 = 76`

`x + 73 = 76 + 26 `

`x + 73 = 102 `

`x = 102 - 73 `

`x = 29 `

`5) 140 : (x - 8) = 7 `

`x - 8 = 140 : 7`

`x - 8 = 20`

`x = 20 + 8 `

`x = 28`

`6) 4.(x + 41) = 400 `

`x + 41 = 400 : 4 `

`x + 41 = 100`

`x = 100 - 41 `

`x = 59 `

`7) 4.(x - 3) = 7^2 - 1^10 `

`4(x - 3) = 49 - 1 `

`4(x - 3) = 48 `

`x - 3 = 48 : 4 `

`x = 12 + 3`

`x = 15 `

`8.)135 - 5(x + 4) = 35`

`-5(x + 4) = 35 - 135 `

`-5(x + 4) = -100 `

`x + 4 = -100 : (-5)`

`x + 4 = 20 `

`x = 20 - 4`

`x = 16`

`9) 25 + 3(x - 8) = 106`

`3(x - 8) = 106 - 25`

`3(x - 8) = 81`

`x - 8 = 81 : 3 `

`x = 27 + 8 `

`x = 35 `

`10) 3^2.(x + 4) - 5^2= 5.2^2 `

`9(x + 4) - 25 = 5×4 = 20 `

`9(x + 4) = 20 + 25 `

`9(x + 4) = 45 `

`x + 4 = 45 : 9 `

`x = 5 - 4 `

`x = 1`