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120=2(p+l)
60=p+l
Selisih:
3-2/3+2 . 60
=1/5.60=12
120 = 2(3x + 2x)
60 = 5x
x = 12
maka panjang = 3(12) = 36 cm
lebar = 2(12) = 24 cm
selisih = 36 cm - 24 cm
= 12 cm