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`a)``x - 5 6/7 = 1 3/4`

`x-41/7=7/4`

`x = 7/4 + 41/7`

`x=213/28`

Vậy `x=213/28.`

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`b)``1 5/9 * x = 28/9`

`14/9 * x = 28/9`

`x = 28/9 : 14/9`

`x = 2`

Vậy `x=2.`

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`c)``x : ( (-2)/5 ) = - 15/16`

`x =  - 15/16  * ( (-2)/5 )`

`x = 3/8`

Vậy `x=3/8.` 

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