$x^3-9x^2+6x$
$\left(3-1^2+2-1\right)-1$
$20x^2-7x+40$
$2x^3+4x^2+2x$
$\frac{1}{x^2}=81$
$-3+10n+5n$
$\int\frac{1+x\left(a-1\right)}{x\left(1-x\right)}dx$
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