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a₂=x-3=a₁+r=2+r ==>a₂=2+2=4=x-3
a₄=8=a₁+3r=2+3r
2+3r=8
3r=8-2
3r=6 /:3
r=2
x-3=4
x=4+3=7
x=7
Pzdr ;)