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18 cm
Step-by-step explanation:
AB = BC. (sides of a square is equal)
5a - 17 = 2a + 4
5a - 2a = 4 + 17
3a = 21
a = 21/3 = 7
Hence , side of square = AB = 5a - 17
= 7x5 - 17
= 35-17 = 18
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