$40\left(\frac{7}{5}\right)a$
$20+90+518$
$37,98\:-\:22,46$
$\sqrt{\frac{x^{-6}}{y^{-4}}}$
$7x^2+9x-10$
$\sqrt{64-\sqrt{49}}$
$e^{6x}\cdot e^{-2x}$
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