$25x-2+13$
$6x^2y+3xy-15x^3y^2$
$\lim_{x\to2}\left(\frac{x^2-2x-63}{x-9}\right)$
$\frac{15a^6}{35a^2}$
$\frac{dp}{dr}=p-p^2$
$\frac{\left(0.8-0.3\right)}{x}$
$\left(\:a^6+\:a^{-6}\:\right)^3$
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