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5x+4y=15200
5(3y)+4y=15200
15y+4y=15200
19y=15200
y=15200/19
y=800
harga penghapus=800
x=3y
x=3(800)
x=2400
harga buku=2400
3buku+penghapus=
3(2400)+800
7200+800
8000