$\frac{7x}{x^2}$
$-x^4+2x^3-1$
$\left(43-25\right)-\left(3-65\right)$
$\lim_{x\to-2}\left(\frac{2+x}{x^2+4}\right)$
$\left(3x^2+n^2\right)\left(3x^2-n^2\right)$
$3x-5x+x=10$
$\frac{3}{x}-\frac{1}{2}$
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