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siswa suka FISIKA murni = 87 - 60 = 27 siswa
suka keduanya = 60 siswa maka :
35 + 27 + x + 60 = 143
1 22 + x = 143
x = 143 - 122
x = 21 siswa yang tida menyukai keduanya
= 95 + 27 +x
= 122 + x
143-122 = x
x=21 siswa