Question

3.(x-1)+3=12

Answer 1

\(3\left(x-1\right)+3=12\)

\(3\left(x-1\right)=12-3=9\)

\(x-1=9:3=3\)

\(x=3+1=4\)

Answer 2

`@` `\text {Ans}`

`\downarrow`

`3*(x-1) + 3 = 12`

`=> 3(x-1) = 12 - 3`

`=> 3(x-1) = 9`

`=> x - 1 = 9 \div 3`

`=> x - 1 = 3`

`=> x = 3 + 1`

`=> x = 4`

Vậy, `x = 4.`