$a$) `2x - 1/3 = 2/3`
`⇔ 2x = 2/3 + 1/3`
`⇔ 2x = 1`
`⇔ x = 1/2`
Vậy `x=1/2`.
$b$) `3/4 - x = 1/3`
`⇔ 3/4 - 1/3 = x`
`⇔ x = 5/12`
Vậy `x=5/12`.
$c$) `-5/6 - x = 2/3`
`⇔ -5/6 - 2/3 = x`
`⇔ -5/6 - 4/6 = x`
`⇔ x = -9/6`
`⇔ x = -3/2`
Vậy `x=-3/2`.
$e$) `x+3/4 = -3/10`
`⇔ x = -3/10 - 3/4`
`⇔ x = -12/40 - 30/40`
`⇔ x = -42/40`
`⇔ x = -21/20`
Vậy `x=-21/20`.
$f$) `1/2 + x = 7/12`
`⇔ x = 7/12 - 6/12`
`⇔ x = 1/12`
Vậy `x=1/12`.
$g$) $|3x+1| - 2 = 4$
$⇔ |3x+1| = 6$
$⇒$ \(\left[ \begin{array}{l}3x+1=6\\3x+1=-6\end{array} \right.\)
$⇒$ \(\left[ \begin{array}{l}x=\dfrac{5}{3}\\x=\dfrac{-7}{3}\end{array} \right.\)
