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salah = -1
tak dijawab = 0
berlaku SPLDV
b+s = 36 |4|
2b -1s = 51 |4|
4b + 4s = 144
8b - 4s = 204
––––—————— –
-4b = -60
b = -60/-4
b = 15x2
b = 30 opsi B
maaf kalo salah...