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((3a+1 - 9a^2)/ (1+3a - 6a)) / ((9a^2 -1 + 1) /( 3a -1 ))= 6a / (3a+1)
((3a+1 - 9a^2)/ (1+3a - 6a)) / ((9a^2 -1 + 1) /( 3a -1 ))= 6a / (3a+1)
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