$6\times52+20n+91$
$\left(3^a+\:x^2\right)^2$
$\int x\sqrt{1+4x^2}dx$
$4x^2+32$
$\frac{2x}{x^2-4}+\frac{x}{x+3}=1$
$6x-7y=-19$
$\frac{du}{dx}+\frac{2x}{u}=2$
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