Đáp án:
`x : 6/7 + 1/3 = 4/15 : 1/6`
`=> x \times 7/6 + 1/3 = 4/15 \times 6/1`
`=> x \times 7/6 + 1/3 = 24/15`
`=> x \times 7/6 = 24/15 - 1/3`
`=> x \times 7/6 = 24/15 - 5/15`
`=> x \times 7/6 = 19/15`
`=> x = 19/15 : 7/6`
`=> x = 19/15 \times 6/7`
`=> x = 38/35`
mong ctlhn cho nhóm ạ~~