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luas=p×l
120=(3x-3)×8
120=24x-24
24x=120+24
24x=144
x=144/24
x=6
B.keliling persegi panjang
K=2(p+l)
K=2((3.6-3)+8
K=2(15+8)
K=2(23)
K=46 cm
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