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2 3/8- (-1 1/6)
3 13/24
Step-by-step:
2 3/8 - (-1 1/6)
2 3/8 + 1 1/6: minus a negative converts to a plus (positive)
19/8 + 7/6: convert whole numbers to fractions and incorporate into the fractions themselves
57/24 + 28/24: convert fractions in Greatest Common Denomination (GCD)
85/24: add the fractions since they have the same denominator now
3 13/24: reduce to whole numbers with the fraction again, reduce the fraction to smallest denominator but can't be in this case because 13 is a prime number and can't be reduced.

Hope this helps.
 

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Book shows & it may be wrong...

2 3/8 - (-1 1/6 )

2 3/8 = 2 9/24

- (-1 5/6) = 1 20/24
-----------------------------------
3 29/24 = 4 29/24
The book is wrong, it changes the value of -1 1/6 to -1 5/6 midway through the explanation, if -1 1/6 was originally -1 5/6 in the first line then the explained answer would be correct.

Remember these books are written by humans, humans make mistakes, so you will find at least a couple of errors in any math book. Used to piss me off when I was trying to learn some tough theory in my college Calculus book and it had an error that slipped through the proof readers.
 
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