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7,6 = 60 + 2k : 10
7,6 x 10 = 60+ 2k
76-60= 2k
16= 2k
8= k
5+8+7+9+7+6+7+9+(K+2)+K
=60+2K/10
=7,6
=7,6×10=76
76-60=16/2 =8
jadi, K=8