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Verified answer
Misalsiswa laki2 = x
siswa perempuan = y
x + y = 42
x = y - 4
y = x + 4
x + y = 42
x + x + 4 = 42
2x + 4 = 42
2x = 42 - 4
2x = 38
x = 19
maka banyak siswa laki2 adalah 19 siswa (D)