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20-x + x + 17-x = 40-8
37-x = 32
x = 37-32 = 5
Jadi, jumlah siswa yang suka keduanya adalah 5
40=20+17-x+8
40= 28+17-x
40-28= 17-x
12=17-x
x= 17-12
x= 5