$2\cdot2^6-3\cdot2^5-2^4+2^3-2^2+4\cdot2$
$6a^2b^2-9a^2b^2$
$x^2-4x=12$
$x^4-26x^2+225$
$\frac{3x^2+18x+20}{x+4}$
$\int\frac{x}{x^3+x^2-x-1}dx$
$2x^2+10x+7=0$
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