$\lim_{x\to\infty}\left(\frac{3x^2-2x^5-x}{x^2-3x^5}\right)$

$\left(\frac{2}{3}-4z\right)\left(\frac{2}{3}+4z\right)$

$\int_0^{\infty}\left(\frac{vx}{\left(1+x\right)^{\left(v+1\right)}}\right)dx$

$\left(5-6x\right)dy-7ydx=0$

$-x-19x-18x$

$8\cdot16+72+8+32+56$

$\frac{4x^4+6x^3+x^2+6x-2}{x^2+1}$