a²-5a-2a+10-(a²-10a+25)=
a²-7a+10-a²+10a-25=
3a-15=
3(a-5)
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a²-5a-2a+10-(a²-10a+25)=
a²-7a+10-a²+10a-25=
3a-15=
3(a-5)