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misal:
permen = a
coklat = b
A membeli 5 permen dan 3 coklat, berarti persamaannya 5a + 3b
Jika harga coklat 3x harga permen, berarti persamaannya b = 3a
berarti harga 1 permen itu:
a = harga 1 coklat / 3
a = b : 3