A=[2 4 6 8;4 5 6 24;2 7 12 30]
A(1,:)=A(1,:)/2
A(2,:)=A(2,:)-4*A(1,:)
A(3,:)=A(3,:)-2
A(2,:)=A(2,:)/-3
A(1,:)=A(1,:)-2*A(2,:)

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