$5x^2-47x+56=0$
$x^2-y^2=9$
$2x+3y-x-y+7x+2y$
$\lim_{n\to\infty}\left(\frac{3^{n-1}}{3^{n-1}+1}\right)$
$\lim_{x\to1}\left(\frac{\ln\left(x\right)-1+x}{\arccot\left(x\right)-\frac{\pi}{4}}\right)$
$x^2+2x-224$
$49x^2-98x+49$
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