`b, 2/3 - |-7/3 + 3/4| - |-5/2 + 1|`
`= 2/3 - |-19/12| - |-3/2|`
`= 2/3 - 19/12 - 3/2`
`= -11/12 - 3/2`
`= -29/12`
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`d, |-5/2 + 3/4 - 1/3| - (-3/4 + {-5}/3)`
`= |-7/4 - 1/3| + 29/12`
`= |-25/12| + 29/12`
`= 25/12 + 29/12`
`= 9/2`
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`f, 1/7 - (3/5 - 1/10) - |2/3 - 1/2|`
`= 1/7 - 1/2 - |1/6|`
`= 1/7 - 1/2 - 1/6`
`= -5/14 - 1/6`
`= -11/21`