$15\cdot3+7$

$\frac{dy}{dx}=-x\left(y-1\right)^2$

$\int\frac{x+9}{x\left(x^2+9\right)}dx$

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

$\log\left(5\right)+\log\left(20\right)$

$\frac{560}{-8}$

$\left(-8+4\right)-\left(5-\left(8+9-2\right)-7\right)-35+\left(4+8-15\right)$