$\int\left(8x^3-7\right)\left(2x^4-7x\right)^6dx$

$\lim_{x\to infinity}\left(\frac{xe^{-2x}}{3e^{2x}-100}\right)$

$\lim_{x\to-\infty}\left(\frac{x-3}{x^{-\frac{1}{7}}}\right)$

$5\left(2a+3\right)$

$\lim_{x\to1}\left(\frac{x-1}{x^2-3x-12}\right)$

$18y-15$

$\frac{dt}{dx}=\frac{5x^2}{4t}$