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pf= 30
lk= 26
20 per 26 = 30 per 33 + x
10 per 13 (diperkecil) = 30 per 33 +x
390 = 330 + 10x
390-330= 10x
60= 10 x
x = 6
jadi sisa karton dibawah foto = 6 cm