Question

Answer 1

x-30=60

=>x=60+30=90(nhận)

Vậy: A={90}

Answer 2

`x - 30 = 60`

`=> x = 60 + 30 `

`=> x = 90`

Vậy `A = {90}`

Answer 3

\(x-30=60\\ \text{X}=60+30\\ \text{X}=90\\ =>A=\left\{90\right\}\)