For this keep this rule in mind whenever you subtract and there is a negative: Keep, Change, Change.
So, 24 stays the same, the minus sign changes to its opposite which is addition, and the negative sign changes into positive:
24 + 4 - 13 = 15
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It is: 24/30 = 4/5 simplified
No, it cannot be further simplified.
It is: 24/90 = 4/15 simplified
13/312 = 1/24
It is: 13/52 = 1/4 simplified