$-3x^2-3$
$\left(x\right)^2+2\left(x\right)\left(7\right)+\left(7\right)^2$
$\lim_{x\to\infty}\left(\sqrt{x^2+x}\:-x\right)$
$-\frac{2x^2y^2}{x^2y^4z^4}$
$\frac{dy}{dx}\cos\left(x\right)=\sin\left(x\right)y+1$
$5\left(2x-1\right)=5$
$x^2-14x+28$
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