$x^{2\:}-\:2x\:=\:3$

$\int\frac{x-1}{x\left(x^2+2x\right)}dx$

$\lim_{x\to\infty}\left(2^{2-x}\right)$

$5b^2+10b+5$

$\:\:\frac{\left(3x^2y\right)}{2}\:\left(\frac{4xy}{y^2}\right)$

$-\frac{30}{13}=\frac{60}{x}$

$5x\left(x+2\right)^3-25x^3\left(x+2\right)^2+15x\left(x+2\right)^4$