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x2−8x−128x^2-8x-128x2−8x−128
−3216-\frac{32}{16}−1632
4x2−21x+54x^2-21x+54x2−21x+5
−7xy2+6x2y+4xy2-7xy^{2}+6x^{2}y+4xy^{2}−7xy2+6x2y+4xy2
(5x+7m2)3\left(5x+7m^2\right)^3(5x+7m2)3
3+x3x+1+x+2x+1=5\frac{3+x}{3x+1}+\frac{x+2}{x+1}=53x+13+x+x+1x+2=5
(m+2n)2−(m−n)2\left(m+2n\right)^2-\left(m-n\right)^2(m+2n)2−(m−n)2
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