(A2-1)/a3-(2a-1)/a3=(a*a-1-2a-1)/a3
(A2-1-2a-1)/a3=(A2-1-2a-1)/a3
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(A2-1)/a3-(2a-1)/a3=(a*a-1-2a-1)/a3
(A2-1-2a-1)/a3=(A2-1-2a-1)/a3