$\lim_{x\to-\infty}\left(\frac{4x-1}{2x+7}\right)$
$\left(7m-4\right)\left(9m+5\right)$
$\lim_{x\to5}\left(\frac{x^2-25}{\sqrt{x^2+11}}\right)$
$2x+200=50$
$4+y^2+z^2=x^2+4z$
$m^2-48m+288=0$
$\lim_{x\to\infty}\left(\frac{8x^3-3x^2-3}{3+5x^2+4x^3}\right)$
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