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60 - 4.5 = 55.5
55.5 + 6.5 = 62
62 : 8 = 7.75
kalo salah maap eak
x= y+4,5
x2= y+6,5
x = 8* 7,5 = 60
60= y +4,5
y= 55,5
rata2 = (55,5 +6,5)/8
= 62/8
= 7,75