\begin{array}{c}\color{#003366}{-Gw}\color{#005A9C}{en}\color{#007ACC}{St}\color{#00AEEF}{ac}\color{#00CFFF}{y}\color{#A4D3EE}{-}\color{#D3D3D3}{}\color{#E0E0E0}{}\end{array} 

`e) 70 - 5(x - 3) = 45`

`5(x-3) = 25`

`x-3 = 25 : 5`

`x - 3 = 5`

`x=8`

Vậy `x = 8`