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48 - 10 = 34 +b - 18
38 =16
38-16 =b
22
ini ambigu
s - s1 = a+b -c
48 - 10 = 34 +18 - c
38 =52
38 - 52 = -c
-14 = -c
c= 14
Nonton tv = 34
Koran = 18
tidak keduanya = 10
suka koran = ??
18 orang