$v^2-9$
$\frac{x^5}{9-x^2}$
$4\cdot\left(5\right)-23$
$1b^6+x^4a^2+x^2ab^3$
$\left(4ba^2\:+5xy^3\:\right)^2$
$-6x^2+5x-50$
$-12.5-\left(-4.8\right)$
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