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Step-by-step explanation:
i). 7/24 - 17/36
lcm of 24 and 36 = 72
7×3 - 17×2/72
21 - 34/72
-13/72
ii). 5/63 - (-6/21)
5/63 + 6/21
lcm of 63 and 21 = 63
5×1 + 6×3/63
5 + 18/63
23/63
I hope it helps you
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