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Verified answer
Kll = 42lebar = x
panjang= x+3
kll= 2(p+l)
42=2(x+x+3)
42=2(2x+3)
42:2=2x+3
21=2x+3
21-3=2x
18=2x
18:2=x
9=x
lebar=9
panjang=9+3=12