$\lim_{x\to7}\left(\frac{x^2-5x+14}{x-7}\right)$
$\frac{1}{x-5}+\frac{x}{3}=2$
$\int\frac{3x-9}{\left(x+2\right)\left(x+1\right)\left(x-1\right)}dx$
$\:\left(-5+a\right)^2$
$21ab:50ab_{i}-60ab,84ab$
$\frac{x^2}{2x+1}>-1$
$36m^4-109m^2n^2+49^4$
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