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panjang1 x lebar1 = panjang2 x lebar2
15(x+4) = 18(x+2)
15x + 60 = 18x + 36
3x = 24
x = 8
L1 = 15(x+4)
= 15(8+4)
= 180
L2 = 18 (x+2)
= 18 (10)
= 180