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5p - 3l = 45cm x2
10p + 10l = 250
10p - 6l = 90
--------------------- - (eleminasi)
16l = 160
l = 10 cm
2p + 2l = 50
2p + 2.10 = 50 (subtitusi)
2p + 20 = 50
2p = 30
p = 15 cm