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x : buku
y: pensil
3x+2y = 5200 x2
2x+3y = 4800 x3
6x+4y = 10.400
6x+9y = 14.400
=> -5y = -4000
y = 800
3x + 2y = 5200
3x+ 2.800 = 5200
3x = 3600
x = 1200
jadi harga buku = 1200, pensil = 800