$89-x=24$
$\frac{x^3\:-2x^2\:+x-1}{x-1}$
$\frac{\left(-3\right)^{-2}}{\left(-3\right)^{-5}}$
$y-5=-4$
$x^2+15x+7$
$tan^{-1}\left(\frac{77.2}{40.6}\right)$
$\frac{15x^7y^4}{5x^5y^{12}}$
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