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a₃-a₁=8
a₁=16-a₃
a₃-a₁=8
a₃-(16-a₃)=8
a₃-16+a₃=8
2a₃=8+16
2a₃=24
a₃=12
a₁=16-a₃
a₁=16-12
a₁=4
a₃-a₁=8
a₂=8
a₁=4
a₂=8
a₃=12