$\lim_{x\to5}\left(\frac{1-\sqrt{6-x}}{\sqrt{x+20}-5}\right)$
$\left(x-0.4\right)\left(x-12\right)$
$\left(3\right)\left(-1\right)+0\left(3\right)+8$
$\left(-11x^6y^2\right)\left(-5mxy^7\right)$
$-\frac{1}{36}x^2=y$
$\frac{x+8}{3}-\frac{x-12}{4}=3$
$\left(-5x^{-3}\right)\left(7x^{\frac{2}{3}}\right)$
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