(x-2)(x+7)-2(3-x)(2+x)
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(x-2)(x+7)-2(3-x)(2+x)(x-2)(x+7)-2(3-x)(2+x)(x-2)(x+7)-2(3-x)(2+x)x+5x-14-2(6+5x-x)=x+5x-14-12-10x+2
(x-2)(x+7)-2(3-x)(2+x)
(x-2)(x+7)-2(3-x)(2+x)
(x-2)(x+7)-2(3-x)(2+x)
x+5x-14-2(6+5x-x)
= x+5x-14-12-10x+2x
=3x-5x-26
多年辛苦
(x-2)(x+7)-2(3-x)(2+x)=3x^2-7x-26=(3x-13)(x+2)
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