$\left(x^3+2x^2-5x+7\right)-\left(4x^3-5x^2+3\right)$
$2-2n=3n+17$
$8x^2-8x=6$
$2x+2+7x$
$\lim_{x\to2}\left(x^3-x+1\right)\cdot\left(2x^3-5\right)$
$6x+y+x+x+9$
$\int\frac{x^2+4}{x^2}dx$
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