$\left(x^2-5\right)\left(x^2+7\right)-\:\left(x^2+3\right)^2$
$-10n+8n$
$n^{-2}$
$\frac{x^2y^3}{xy^2}$
$p^2\:+\:16p+64=\:-43$
$y'+5^{x+y}=0$
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