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the length of all sides of a square is equal to each other
Therefore , 18x-20 = 42-13x
= 18x+13x = 42+20
= 31x = 62
x= 62/31 = 2
Length of each sides are Same
Therefore , 18x-20 = 18*2-20
= 36-20
Side = 16 unit
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