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hrg pensil = y
maka :
3x+5y = 42.000
x = 3y
sudtitusi nilai x, menajdi :
3x + 5y = 42.000
3(3y) + 5y = 42.000
9y + 15y = 42.000
24y = 42.000
y = 42.000/24
y = 1.750
jadi harga pensil = 1.750
harga buku = 3 x 1.750 = 5.250