`( 1/3 + 2/4 ) - 1/2`
`= ( 4/12 + 6/12 ) - 6/12`
`= 10/12 - 6/12`
`= 4/12 = 1/3`
__________________
`( 2/3 + 3/4 ) + 5/3`
`= ( 8/12 + 9/12 ) +20/12`
`= 17/12 + 20/12`
`= 37/12`
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