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54=2p+2l
54=2(2x+3)+ 2(x)
54= 4x+6+2x
54= 4x+2x+6
54= 6x+6
54-6= 6x
48=6x
8=x
luas: panjang x lebar
= 2(8)+3 x 8
=16+3x8
=16+24
=40 cm²