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x= 39
39 - 3 - 30 = 6
x= tinggi karton
panjang karton = ?
ket : L = lebar , T = tinggi
L foto = L karton
T foto T karton
20cm = 26cm
30cm x (kali silang)
20x = 780
x = 39cm
tinggi karton adalah 39cm
lebar karton di bagian bawah foto
= 39 - 30 - 3 = 6cm
maaf klo salah ya