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40x = 60 . 28
x = (60 .28)/40
x = 42
60-(42+6)
60-48 = 12
tinggi foto=54-x
tinggi foto/tinggi karton=lebar foto/ lebar karton
54-x/60=28/40
54-x=28/40 x60
54-x=7/10 x 60
54-x=42
x=54-42
x=12 cm