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a13=a1+12r
a9=a1+8r
12r-8r =20
4r=20
r=20/4
r=5
a3=7
a1+2r=7
a1+2*5=7
a1=7-10
a1=-3
an=-3+5n-5
an=5n-8 wzór ciagu
a10=5*10-8 =42
a100=5*100-8 =492