aについてくくる
5a^2+(3-7b)a-(6b^2-7b+2)
= 5a^2+(3-7b)a-(2b-1)(3b-2)
=(5a+3b-2)(a-2b+1)
以下確かめ
5a^2-10ab+5a+3ab-6b^2+3b-2a+4b-2
=5a^2-7ab+3a-6b^2+7b-2
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