$r^2-5r-6$
$k^2+18k+81$
$-x<5$
$\int_0^{\frac{\pi}{2}}\left(\frac{5\cos\left(x\right)}{\sqrt{sin\left(x\right)}}\right)dx$
$\left(\frac{2}{3}y^2c-\frac{3}{4}b\right)^3$
$81-36a+4a^2$
$\lim_{y\to3}\left(x^3\right)$
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