$-y=-4-2x$

$\frac{dy}{dx}\left(2\sqrt{x}+\sqrt{y}-3\right)$

$-14+2\cdot5$

$\lim_{x\to0}\frac{5sin\left(9x^8\right)}{-4x}$

$\left(\frac{1}{3}x-\frac{2}{3}y\right)\left(\frac{1}{3}x+\frac{2}{3}y\right)$

$ln\left(\frac{e^2}{\sqrt[5]{x^3}}\right)$

$3x\left(2x+5\right)-6\left(2x+5\right)^2$