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((18x65)+(2xn)) : (18+2) = 64
(1.170+2n) : 20 = 64
1.170+2n = 64x20
1.170+2n = 1.280
2n = 1.280-1.170
2n = 110
n = 110:2
n = 55 → nilai rata2 2 org yg ikut ulangan susulan