` a) ` ` 3x - 5 = 2x + 4 `
` => 3x - 2x = 4 + 5 `
` => x = 9 `
Vậy ` x = 9 `
` b) ` ` 2(3x - 4) + 7 = 5x - 2 `
` => 6x - 8 + 7 = 5x - 2 `
` => 6x - 5x = 8 - 7 - 2 `
` => x = -1 `
Vậy ` x = -1 `
` c) ` ` (x - 3)^2 = 16 `
` => ` \(\left[ \begin{array}{l}x-3=4\\x-3=-4\end{array} \right.\)
` => ` \(\left[ \begin{array}{l}x=7\\x=-1\end{array} \right.\)
Vậy ` x = 7 ` hoặc ` x = -1 `
` d) ` ` (2x - 1)^3 = -27 `
` => 2x - 1 = -3 `
` => 2x = -2 `
` => x = -1 `
Vậy ` x = -1 `
