Question

Tìm x biết : 5.(x-3)-3.(x+1)=-12

Answer 1

`5.(x-3)-3(x+1)=-12`

`5x-15-3x-3=-12`

`2x-18=-12`

`2x=6`

`x=3`

Vậy `x=3`

Answer 2

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

`<=> 5x-15 -(3x+3)=-12`

`<=>5x-15 -3x-3=-12`

`<=>2x - 18=-12`

`<=>2x= 6`

`<=>x=3`

vậy phương trình có nghiệm `x=3`

Answer 3

\(5\left(x-3\right)-3\left(x+1\right)=-12\\ 5x-15-3x-3=-12\\ 5x-3x-\left(15+3\right)=-12\\ 2x-18=-12\\ 2x=-12+18\\ 2x=6\\ x=3\)