$\left(\frac{1}{x+5}\cdot\:\frac{x+5}{5}\right)+\left(\frac{5}{x+5}\cdot\:\frac{10}{x^2+14x+45}\right)$
$\frac{\sqrt{-231}}{4}$
$83\cdot77$
$\frac{1}{12}\left(6.1721\right)$
$-5ab^3+3ab^3-8ab^3$
$\left(x\right)x^2-1$
$6+10a+8$
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