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panjang Kertas= Lk=42 + 2x
lebar kertas = Tk= 45+11+x = 56 + x
panjang foto = Lf = 42
lebar foto= Tf= 45
Lk/Tk = Lf/Tf
Lk = Lf/Lt (Tk)
42+ 2x = (42 /45) ( 56+x)
45(42 + 2x) = 42(56+x)
90x - 42 x = 2.352 - 1.890
48 x = 462
x=9,625
ukuran kertas
panjang kertas = 42 + 2x = 61,25
lebafr kertas =56+ x= 65,625