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aku pakek smart solution yg diajarin..tapi blm terlalu ngerti pljaran itu..maaf kalo salah..
ntar dapetnya a = 5 b= 6 lewat cara elemenasi dan subtitusi
habis itu dimasukin dah nilainya
U20 = 5 + (20 - 1)4
= 5 + 76
= 81