$7y-28y^3$
$\lim_{x\to-\infty}\left(\frac{4^x+13^x}{2}\right)$
$-4\:+\:15\::\:3$
$\int\left(2y\right)dy$
$\left(5a+\frac{3}{5}a^2\right)^2$
$xydx=\left(y^2-xy+x^2\right)dy$
$-24\left(-7\right)\left(7\right)$
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