$-10-4n+7$
$2x^2-6x+5$
$\frac{10x-74}{x^2+2x-35}$
$\lim_{x\to infinity}\left(\frac{4x^2-6x+7}{x^2-7x+1}\right)$
$216\:-\:5$
$400+r=150$
$y^2-xy=0$
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