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3s + 2j = 33000
6s + 9j = 96000
6s + 4j = 66000
eliminasi
5j = 30000
j = 6000
2s + 3j = 32000
2s + 3(6000)= 32000
2s + 18000 = 32000
2s = 14000
s = 7000
netta membeli 4 kg salak dan 2kg jeruk, maka
4s + 2j =4(7000) + 2(6000)
= 28000 + 12000
= 40000