$-x-3x+a$
$3^{x+10}\:+\:1\:=\:10$
$\lim_{x\to1}\left(\frac{nx^n}{n+1}\right)$
$\lim_{x\to1.57}\left(\frac{5-5sinx}{7+7cos2x}\right)$
$\frac{y^2}{y-6}$
$y^2+y=.25$
$\frac{x\left(x-3\right)}{3-x}$
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