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a5=a1+4r
Podstawiamy w miejsce a2 i a5 liczby
a1+r=6
a1+4r=162
a1=6-r
6-r+4r=162
3r=156
r=52
to a1=6-52=-56
S7=(2a1+6r)*7/2= (-112+312)*7/2= 1400/2=700