$-6x^2+5x-50$
$\frac{\left(x-1\right)}{x+1}\cdot\frac{\left(x-1\right)}{x+1}\cdot x+2ln\left(x+1\right)$
$\lim_{x\to0}\left(\frac{x-3}{\sqrt{x-2}-\sqrt{4-x}}\right)$
$6\cdot3+6$
$12\cdot5-3\cdot20$
$\left(6\sqrt{\left(\frac{\left(x^2+3\right)}{\left(x^2+4\right)}\right)}\right)$
$14x\:+\:10=9x+20$
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