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(A+B) : 2 = 3000 kita ubah jadi A+B = 6000 (soal)
sampai situ ngerti ?
lalu kita eleminasi
-A + B = 500
(A+B) = 6000
kurangkan
- 2A = - 5500
A = 5500/2
A = 2750
masukin ke persamaan
-A + B = 500
B = 3250
jadi harga beras A = 2750/kg