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Lebar foto = 18 cm
panjang karton = 24 - (5 + 5) = 24 - 10 = 14 cm
Lebar karton = 18 - (5 + x) = 13 - x cm
24 cm = 14 cm
18 cm = 13 - x cm
(13 - x)(24) = (18)(14)
312 - 24x = 252
-24x = 252 - 312
-24x = -60
24x = 60
x = 60 / 24
x = 2,5 cm