Tìm x ; $\frac{-2}{3}$ x -$\frac{1}{4}$ -$\frac{1}{5}$ x=$\frac{-1}{6}$

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`