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3n-4 = 3(2)- 4 = 6-4 =2
4n-5 = 4(2)-5 =8-5 =3
5n-3 = 5(2)- 3 = 10-3 = 7
2+3+7= A. 12
n=2 >>>> 2 ; 3 ; 7
Jumlahny 2+3+7 = 12
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