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a2=6
a3=5a+14
a2-a1=a3-a2
6-18=5a+14-6
5a=-12-8
5a=-20
a=-20/5
a=-4
...............
lub ze wzoru na wyraz srodkowy
a2=[a1+a3]/2
6=[18+5a+14]/2 /*2
12=5a+32
5a=12-32
a=-20/5
a=-4
Wobec tego :)
[ 18 +5a+14] / 2=6 I* 2
5a+32=12
5a = 12-32
5a=-20 I: 5
a= -4