Đáp án:
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`(-2)/3x - 1/4 - 1/5x = (-1)/6`
`↔ (-2)/3x - 1/5x - 1/4 = (-1)/6`
`↔ ( (-2)/3 - 1/5)x - 1/4 = (-1)/6`
`↔ ( (-10)/15 - 3/15)x - 1/4 = (-1)/6`
`↔ (-13)/15x - 1/4 = (-1)/6`
`↔ (-13)/15x = (-1)/6 + 1/4`
`↔ (-13)/15x = (-2)/12 + 3/12`
`↔ (-13)/15x = 1/12`
`↔ x = 1/12 ÷ (-13)/15`
`↔ x = 1/12 × (-15)/13`
`↔ x = (-5)/52`
Vậy `x = (-5)/52`