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2p -q =3 |x2| 4p-2q= 6
------------------ -
5q = 14
q = 14/5 = 2,8
2p - q = 3
2p - (2,8) = 3
2p = 3 + 2,8
2p = 5,8
p = 2,9
2p-q=3 |x3
4p+3q=20
6p-3q=9
---------------- +
10p = 29
p= 29/10
p=2,9