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jumlah nilai saat ditambah 2 orang
10x7,2=72
jumlah nilai kedua orang=72-52=20
6,5(8)+2x / 8+2= 7,2
52+2x= 72
2x=72-52
2x= 20
x=10
jumlah nilai 2 orang tersebut 2x= 2(10)=20