$x-3=\:-5$

$\left(x+y-2\right)\left(x-y-2\right)$

$f\left(x\right)=\left(x^2-7\right)\left(x^3+4x+2\right)$

$\int\ln\left(x^2\right)\cdot\left(\frac{1}{x^3}\right)dx$

$\sqrt{x}+11=15$

$\lim_{x\to1}\left(\frac{x^3+x^2-2}{2-\sqrt{x+3}}\right)$