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arif >> 3b + 5p = 12.300
3b +5(5.400-2b) = 12.300
3b - 10b = 12.300 - 27.000
-7b = -14.700
b = -14.700/-7 = 2.100
p = 5.400 - 2x2.100 = 1.200
denah membeli 5b + 4p, membayar (5x2.100) + (4x1.200) = 10.500 + 4.800 = Rp. 15.300