$\int7x^5e^{-7x}dx$
$144x^2+24xy+y^2$
$\frac{\left(7n^2\right)^2-\left(9m^3\right)^2}{7n^2+9m^3}$
$\int x^7e^{4x}dx$
$4x^2-4x-15$
$\lim_{k\to\infty}\left(\frac{t}{\left(e^k+z\right)e^k}\right)$
$15-\left(6-9+5\right)$
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