tim x a.x+5\7=1\9 b.5.(-2\15)-x=-3\10 c.9.7\4-x=7\8 giup em em vote 5 sao ak

`a, x + 5/7 = 1/9`

`=> x = 1/9 - 5/7`

`=> x = 7/63 - 45/63`

`=> x = -38/63`

Vậy `x = -38/63`

`b, 5. (-2/15) - x = -3/10`

`=> -2/3 - x = -3/10`

`=> x = (-2)/3 - (-3)/10`

`=> x = -2/3 + 3/10 = -11/30`

Vậy `x = -11/30`

`c, 9. 7/4 - x = 7/8`

`=> 63/4 - x = 7/8`

`=> x = 63/4 - 7/8`

`=> x = 119/8`

Vậy `x = 119/8`