$3\left(-1\right)^3+2\left(-1\right)^2-\left(-1\right)+7$

$16xy-12xy+4xy-3xy$

$\lim_{x\to-3}\left(\frac{x^2+6x+9}{x^2+7x+12}\right)$

$\left(ax+b\right)\left(ax-b\right)$

$\frac{d}{dx}\left(8y-3x+5=0\right)$

$\lim_{x\to\infty}\left(\frac{x}{\sqrt{5+x}}\right)$

$\left(x^2+6y^2\right)\left(x^2-6y^2\right)$