Đáp án :
`a) x = -1/35`
`b) x = 1`
`c) x = 13/70`
`d) x = -65/7`
`a)`
`x + 3/5 = 4/7`
`⇒ x = 4/7 - 3/5`
`⇒ x = -1/35`
`Vậy S = {-1/35}`
`b)`
`x - 5/6 = 1/6`
`⇒ x = 1/6 + 5/6`
`⇒ x = 1`
`Vậy S = {1}`
`c)`
`(-5)/7 - x = (-9)/10`
`⇒ x = (-5)/7 + 9/10`
`⇒ x = 13/70`
`Vậy S = {13/70}`
`d)`
`5/7 - x = 10`
`⇒ x = 5/7 - 10`
`⇒ x = -65/7`
`Vậy S = {-65/7}`
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