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a5=a1+(5-1)r=a1+4r
2r-4r=2-(-16)
-2r=18 / :(-2)
r= -9
a3=2
a2=2+9=11
a1=11+9=20
a4=2-9=-7
a5=-7-9=-16
Mam nadzieję że pomogłem :D