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anak-anak = y
x+y = 575 (kedua ruas kali 5) --> 5x +5y = 2875
5000x + 3000y = 2575000 --> 5x+3y = 2575
2y = 300 --> y = 150
x+ y= 575
x+150 = 575
x = 425
banyak orang dewasa = 425