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salah = -2
kosong = -1
menjawab 40 soal, maka kosong = 10
misal x = benar dan y = salah
x + y = 40
4x + (-2y) - 10 = 96
4x - 2y = 96 + 10
4x - 2y = 106
2x - y = 53
gunakan eliminasi
2x - y = 53
x + y = 40__ +
3x = 93
x = 93/3
x = 31