Question

Giải phương trình 4( 18- 5x) – 12( 3x – 7) = 15( 2x – 16) – 6(x+ 14)

Answer 1

\(4\left(18-5x\right)-12\left(3x-7\right)=15\left(2x-16\right)-6\left(x+14\right)\\ < =>72-20x-36x+84=30x-240-6x-84\\ < =>20x+36x+30x-6x=72+84+240+84\\ < =>80x=480\\ < =>x=\dfrac{480}{80}\\ < =>x=6\)

Vậy: ... 

Answer 2

`4( 18- 5x) - 12( 3x - 7) = 15( 2x - 16)- 6(x+ 14)`

`<=>72-20x-36x+84=30x-240-6x-84`

`<=>72+84-20x-36x=30x-6x-240-84`

`<=> 156-56x=24x-324`

`<=> 24x+56x=156+324`

`<=>80x=480`

`<=>x=6`

Vậy: `x=6`

Answer 3

`4(18- 5x) - 12( 3x- 7) = 15( 2x - 16) - 6(x+ 14)`

`=> 72 - 20x - 36x + 84 = 30x - 240 - 6x - 84`

`=> 156 - 56x = 24x - 324`

`=> 24x + 56x = 156 + 324`

`=> 80x = 480`

`=> x = 480 : 80`

`=> x = 6`

Vậy ...