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120 = 2(3x + 2x)
120 = 2(5x)
120 = 10x
120/10 = x
12 = x
panjang = 3x = 3.12 = 36 cm
lebar = 2x = 2.12 = 24 cm
Luas persegipanjang = panjang x lebar
= 36 x 24
= 864 cm²