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Misalkan y = Harga sebuah pensil.
x = 3y
4x + 3y = 24000
4(3y) + 3y = 24000
12y + 3y = 24000
15y = 24000
y = 1600
x = 3y
x = 3(1600)
x = 4800
3x + y = 3(4800) + 1600
= 14400 + 1600
= 16000
Jadi, jumlah uang yang harus dibayar oleh Syifa adalah Rp 16.000,00.