-(3x^2-x+2)=-2+(x^2-8x)
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-(3x^2-x+2)=-2+(x^2-8x)-(3x^2-x+2)=-2+(x^2-8x)-(3x^2-x+2)=-2+(x^2-8x)-3X^2+X-2=-2+X^2-8X〜
-(3x^2-x+2)=-2+(x^2-8x)
-(3x^2-x+2)=-2+(x^2-8x)
-(3x^2-x+2)=-2+(x^2-8x)
-3X^2+X-2=-2+X^2-8X〜〜〜4X^2-9X=0〜〜〜X（4X-9）=0〜〜〜X=0或X=4／9
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