$ay'-y=1$
$\left(7+9u\right)\left(7-9u\right)$
$5x\:+\:7\:<\:2x\:+19$
$216x^9+125y^3$
$\int_5^{\frac{1}{x}}\left(arctan\left(6t\right)\right)dt$
$2y-72y-7$
$\lim_{x\to2}\left(\frac{t^2-\frac{1}{4}}{t-\frac{1}{2}}\right)$
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