please answer this question step by step explanation
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perimeter = 76/5
length of 2 sides = 11/2 and 7/2
perimeter = s1 +s2+s3
76/5 = 11/2+7/2+x
x = 76/5-11/2-7/2
x = 162-55-35/10
x = 72/10m
x = 7 2/10
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