Đáp án:
`x=(-2)/5`
giải thích các bước giải :
`1/2 x - x/3 = 1/3 - 2/3 - 2/3x`
`⇔ 1/2 x - x × 1/3 = (-1)/3 - 2/3x`
`⇔ (1/2 - 1/3)x = (-2)/3x - 1/3`
`⇔ (3/6 - 2/6)x=(-2)/3x-1/3`
`⇔ 1/6x=(-2)/3x-1/3`
`⇔1/6x + 2/3x=(-1)/3`
`⇔ (1/6+2/3)x=(-1)/3`
`⇔ (1/6+ 4/6)x=(-1)/3`
`⇔5/6x=(-1)/3`
`⇔x=(-1)/3÷5/6`
`⇔x=(-1)/3 × 6/5`
`⇔x=(-2)/5`
Vậy `x=(-2)/5`