$2x^2+5x=7$
$\frac{x^3-x^2+x+1}{x^2-1}$
$5x-8y+4z\:;x=6\:;\:y=9\:;\:z=3$
$\left(x^3+7\right)\left(x^3+13\right)$
$5x^2-30x+45$
$\left(-2cd^2\right)\left(-3dc^7\right)\left(-5c^2d^3\right)$
$\frac{x^4-x^3+x^2-5}{x^2+1}$
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