`a, x + 1/12 = -3/8`
$\Leftrightarrow$ `x = -3/8 - 1/12`
$\Leftrightarrow$ `x = -11/24`
$\text{Vậy}$ `x = -11/24`
________________
`b, x - 2 = -5/9`
$\Leftrightarrow$ `x = -5/9 + 2`
$\Leftrightarrow$ `x = 13/9`
$\text{Vậy}$ `x = 13/9`
______________
`c, 2/15 - x = -3/10`
$\Leftrightarrow$ `x = 2/15 + 3/10`
$\Leftrightarrow$ `x = 13/30`
$\text{Vậy}$ `x = 13/30`
________________
`d, -x + 4/5 = 1/2`
$\Leftrightarrow$ `-x = 1/2 - 4/5`
$\Leftrightarrow$ `-x = -3/10`
$\Leftrightarrow$ `x = 3/10`
$\text{Vậy}$ `x = 3/10`
