$f\left(x\right)=\frac{x^2+6x-27}{x^2-8x+7}$
$8x^5y^4+4x^4y^5+12x^3y^6$
$\frac{10a^7b^9}{15a^5b^9}$
$5x+3\le3x+1$
$x+2>=6$
$5x-3x^2+1$
$\lim_{x\to-1}\left(x^2-3x+2\right)$
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