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(9a^4 +1-11a^2)-(a+8a^2 +2)-(6a^2 -9)

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(9a^4 +1-11a^2)-(a+8a^2 +2)-(6a^2 -9)

9a^4 +1-11a^2 -a-8a^2 -2 -6a^2 +9

9a^4 -11a^2-8a^2-6a^2 -a +1-2+9

9a^4 -25a^2 -a +8