(a²-5a+2)+(10a²-2a)-(6a²-2a)=a²-5a+2+10a²-2a-6a²+2a=a²+10a²-6a²-5a-2a+2a+2=5a²-5a+2
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(a²-5a+2)+(10a²-2a)-(6a²-2a)=a²-5a+2+10a²-2a-6a²+2a=a²+10a²-6a²-5a-2a+2a+2=5a²-5a+2