$\left(7m-8n^2x^3\right)^3$

$5-x^2=3-x$

$12\cdot12^2$

$\left[\left(x^2-2x\right)+3\right]\left[\left(\left(x^2-2x\right)-3\right)\right]$

$\left(y-7\right)\left(y+1\right)$

$\left(3m^2+7n^3\right)\left(9m^4-21m^2n^3+49n^6\right)$

$\lim_{x\to2}\left(4x-7\right)^{\frac{3}{2x-4}}$