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25+33+11-x = 60
69-x = 60
-x = 60-69
-x = -9
x = 9
jadi, banyak siswa suka minum teh maupun susu adalah 9 orang
69-n=60
n=69-60
n=9
jadi banyak siswa yang suka minum tehn dan susu ada 9 orang