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因数分解ですよね？
共通因数で括れないので、次数の低い文字について整理します。
-8a+2ax+x²-16
＝a(-8+2x)+(x+4)(x-4)
＝2a(x-4)+(x+4)(x-4)
＝(x-4)(2a+x+4)
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