Simple Fraction Addition & Subtraction

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`1/5 + 1/7 =`

`1/3 + 1/5 =`

`1/2 - 1/3 =`

`1/4 - 1/9 =`

`1/9 + 1/7 =`

`1/8 + 1/4 =`

`1/5 - 1/7 =`

`1/3 - 1/8 =`