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k=70
<=> 2×(p+l)=70
<=> p+l=70/2
<=> p+l=35
<=> (l+5)+l=35
<=> l+l+5=35
<=> 2l+5=35
<=> 2l=35-5
<=> 2l=30
<=> l=30/2
<=> l=15
p=l+5
<=> p=15+5
<=> p=20
jadi panjangnya 20m dan lebarnya 15m