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Verified answer
(12-x)×(9-x)=54108-12x-9x+x²=54
x²-21x+108-54=0
x²-21x+54=0
(x-18)(x-3)=0
x=18 atau x=3
tetapi karena kertas awal panjangnya 12 gak mungkin disobek 18 sehingga kita pilih x=3