$-3x+5\left(-x-5\right)+20$
$\lim_{x\to3}\left(\frac{x^3-9x}{x^2-9}\right)$
$4x-1=4x+3$
$x^2+8x+16=\left(x+4\right)^2$
$\lim_{x\to2}\left(\frac{ln\left(x^2-3\right)}{2x-4}\right)$
$\frac{x^5-3x^3-6}{x-1}$
$\left(1\right)^5+\left(1\right)^4+\left(1\right)^3-\left(1\right)^2-\left(1\right)-1$
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