Question

    Tính x

Answer 1

`(x-3)/3 = ( x+1)/4`

`=> 4( x-3 ) = 3( x + 1 )`

`=> 4x-12=3x+3`

`=> 4x-3x=3+12`

`=> x=15`

Vậy `x=15` 

Answer 2

\(\dfrac{x-3}{3}=\dfrac{x+1}{4}\\ =>\left(x-3\right)\cdot4=3\left(x+1\right)\\ 4x-12=3x+3\\ 4x-3x=3+12\\ x=15\)