$x^2-4x-7x+6+3x-5$
$-2x-x+5y-2y$
$\lim_{x\to-5}\left(\frac{2-\sqrt{4x-12}}{x-4}\right)$
$43-\left(-12\right)+\left(-8\right)+40-5$
$\lim_{x\to1}\left(\frac{5x^3+2x^2-7}{x^4+3x}\right)$
$\lim_{x\to2}\left(\frac{3x^2+7x-2}{x^2-5x+14}\right)$
$\frac{dx}{dy}=\frac{x}{y}$
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