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y = paku
3x + 2y = 2800 × 3
3x + 1 y = 2100 × 3
9x + 6y = 8400
9x + 3y = 6300
dikurang
3y = 2100
y = 2100/3
Y = 700
harga 1 paku = Rp 700
5 paku = 5× 700 = Rp 3500
5 baut = 5 × sekitar Rp 466,66 = Rp 2333,33
Total Harga = kurang lebih 3500+2333,33 = Rp 5833,33