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75= 1200 +72x / 15+x
75 (15+x) = 1200+72x
1125+75x = 1200 + 72x
1125-1200 = 72x-75x
-75 = -3x
15 = x
jadi banyak siswa kelas 9A adalah 15 orang
jadikan jawaban terbaik ya...
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