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a₂=2^(x+1)
a₃=2^(x+1) +6
a₂=a₁+r
a₃=a₁+2r=a₂+r
2^(x+1)+6=2^(x+1)+r
r=6
2^(x+1)=2+6
2^(x+1)=8
2^(x+1)=2³
x+1=3
x=2