$\frac{dy}{dx}=e^{-2x-3y}$

$+14\left(+9-9\right)+8-3\left(+15-7\right)-7\left(+5-4\right)$

$120x^4y^2\:+\:180x^3y^3\:-\:240x^2y^4$

$4ab^2+6ab^2-6a^2b$

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

$\int\frac{\left(x+3\right)}{x^2+25}dx$

$\left(7p^4+4a\right)^2$