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y = pensil
(2x + 4y = 18.000)x1
(3x + y = 23.000)x4
2x + 4y = 18.000
12x + 4y = 92.000
___________________ -
-10x = -74000
x = 7400 (buku)
y = *subtitusi* 800
makaaa
5x + 2y = 5(7400) + 2(800) = 38600