2a-6+2a+4-2(3a+6-a^2-2a)=4a-2-2(a+6+a^2)=4a-2-2a-12-2a^2=2a-14-2a^2=2(a-7-a^2)
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2a-6+2a+4-2(3a+6-a^2-2a)=4a-2-2(a+6+a^2)=4a-2-2a-12-2a^2=2a-14-2a^2=2(a-7-a^2)