$7^2\cdot2-9$

$\lim_{x\to3}\left(\frac{x-3}{2x}\right)^{\frac{x+3}{2x}}$

$x\:\frac{dy}{dx}$

$\lim_{x\to\infty}\left(4x+a-7ax\right)$

$-4\left(x\:+4\:\right)+2=-7.5\:-\:\left(-2x\:+8.9\right)$

$\lim_{x\to0}\left(18x\cos\left(x\right)\right)^{\frac{1}{x}}$

$\left(\frac{3}{4}x^3+\frac{1}{2}x^5-\frac{2}{5}x^2+11\right)-\left(\frac{1}{2}x^5-8x^3+12x^4-32\right)$