$\frac{x^5-x^4+3x^2-2}{x^2+1}$
$x^4-6x^3+5x^2$
$9a^4+5b^2+2a^4=11a^4+5b^2$
$\left(7a^2-5\right)^2$
$\left(7x+1\right)\left(4x-2\right)$
$n+2n$
$\frac{\left(-942+128x^2-31x+12x^3\right)}{\left(x+4\right)\left(x+6\right)\left(x-3\right)-\left(x-3\right)}$
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