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laki-laki = 2x + 7
jumlah total = 52
x + 2x + 7 = 52
3x + 7 = 52
3x = 52 - 7 = 45
x = 45/3 = 15
maka
a) laki-laki = 2x + 7 = 2 × 15 + 7 = 30 + 7 = 37 murid
b) wanita = x = 15 murid