$7z^2+5-8z^2-z-2z^2+9$
$\lim_{x\to\infty}\sqrt{x^2+x+1}-\sqrt{3x^2-1}-3x$
$-9\left(x+2\right)+4\left(x-6\right)$
$16x^2+\frac{2}{3}\left(36\right)x+9$
$\left(2p-3\right)^4$
$\frac{2a^4-a^3-21a^2+7a+4}{2a^2+5a-4}$
$\frac{dy}{dx}=x+7y,\:y\left(0\right)=5$
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