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6n - p = 5
jadi mengeliminasi p
3n + 2p = 0
12n - 2p = 10
_________+
15n = 10
n = 0,2
3n + 2p =0
3(0,2) + 2p = 0
0,6 +2p = 0
2p = -0,6
p = -1,2