Find the sum of the following expressions: \[ 2-a+8 a^{2}-a^{3} ; 2 a^{3}-3 a^{2}+2 a-2 ;-3 a+7 ...

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Find the sum of the following expressions:
\[
2-a+8 a^{2}-a^{3} ; 2 a^{3}-3 a^{2}+2 a-2 ;-3 a+7 a^{3}-5 a^{6}
\]
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