$-hk-hv$
$x^2+16x+10$
$-\frac{7}{9}q-\frac{2}{3}q$
$81\cdot62$
$\frac{5-5}{\frac{1}{5}-\frac{1}{5}}$
$\lim_{x\to2}\left(2x^3-20x^2\right)$
$49\cdot51$
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