$\int\left(e^{4\cdot x}\left(5+e^{4\cdot x}\right)\right)dx$

$\frac{x-1}{2-x-x^2}$

$1238-\left(900\right)$

$\left(\frac{16}{25}j-\frac{7}{8}a\right)^2$

$\lim_{x\to36}\left(\frac{1}{\left(\sqrt{x}-6\right)}-\frac{12}{x-6}\right)$

$5x\:+\:20\:=\:15$

$y=\frac{3x^{3}+x}{x}$