Đáp án:
$a/$ `2/3x + 1/5 = 7/10 - x`
`-> 2/3x + 1/5 - 7/10 + x = 0`
`-> (2/3x + x) + (1/5 - 7/10) = 0`
`-> 5/3x - 1/2 = 0`
`-> 5/3x = 1/2`
`-> x = 3/10`
`text{Vậy}` `x = 3/10`
$b/$ `3 1/3x + 16 3/4 = -13,25`
`-> 10/3x + 67/4= -13,25`
`-> 10/3x = -30`
`-> x = -9`
`text{Vậy}` `x = -9`
$c/$ `(3 4/5 - 2x) . 1 1/3 = 5 5/7`
`-> (19/5 - 2x) . 4/3 = 40/7`
`-> 19/5 - 2x = 30/7`
`-> 2x = (-17)/35`
`-> x = (-17)/70`
`text{Vậy}` `x = (-17)/70`