a. x + 4/5 = 8/9 b. x - 7/2 = 3/4

`a) x + 4/5 = 8/9`

`x = 8/9 - 4/5`

`x = 40/45 - 36/45`

`x = 4/45`

____________________

`b) x - 7/2 = 3/4`

`x = 3/4 + 7/2`

`x = 3/4 + 14/4`

`x = 17/4`

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