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panjng foto = 30-3-3=24
lebar foto = 40-3-x = 37-x
maka:
24/30 = 37-x / 40
40.24 = 37.30-x.30
960 = 1110 - 30x
30x = 1110-960
30x = 150
x = 5
jadi sisa karton dibawah yaitu 5 cm
semoga bisa membantu ^^