$-5x-3x+4y$

$l\lim_{x\to\infty}\left(\frac{\left(\sqrt{x}ln\left(x\right)-x\right)}{\sqrt{x}}\right)$

$\left(1+3x\right)\left(1-3x\right)\left(1+9x^2\right)$

$-30h-3$

$6x^2y+7xy$

$\left[\frac{5}{3}y+\frac{4}{3}w\:\right]\left[\frac{5}{3}y-\frac{4}{3}w\:\right]$

$-2x^2+30x=112$