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2x+4y=7400|x3| 6x+12y=22200 {2}
pengerjaan 1 dikurangi pengerjaan 2 =
-8y=-12000
y= -12000/-8= 1500
y(buku tulis)= 1500/buah
3x+2(1500)=5100
3x+3000=5100
3x=5100-3000
3x=2100
x=2100/3=700
x(pensil)= 700/buah