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I had this question before but I got it wrong can you please help me

I had this question before but I got it wrong can you please help me-example-1
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User Elnoor
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\begin{gathered} \text{Let' s assume the initial side of square is x.} \\ The\text{ final perimeter is=70 in} \\ 4(x+2.5)=70 \\ x+2.5=17.5 \\ x=15 \\ So,\text{ the original side was 15 in.} \end{gathered}

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