$7w+5-3w-15+2z$

$\int_x^{\sqrt{x^2-1}}dx$

$\frac{5}{6x}-\frac{3}{8x}$

$\int\left(-x\right)\ln\left|7x\right|dx$

$\left(3x-2\right)\left(3x+2\right)\left(9x^2+4\right)-81x^4$

$cos\left(y\right)\cdot\frac{dy}{dx}=\frac{x}{1+y}$

$\frac{dy}{dx}\left(x^2+4y^2=7+3xy\right)$