$\frac{x}{7}-1=\frac{x}{7}$
$-314.99+218.15$
$\left(a+b-5\right)^2$
$7mn+14m^2n+21mn^2$
$\lim_{x\to-\infty}\left(\frac{2x}{\sqrt{x^2-4}}\right)$
$\lim_{x\to-2}\frac{x^2+4x+4}{x^2-4}$
$5\cos\left(x\right)+1=8cos\left(x\right)$
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