$\frac{50x}{x}$
$\sqrt{2}\left(9+b^2\right)^4$
$\left(5b+4c\right)\left(5b-4c\right)$
$x^2-2kx+3x=0$
$\lim_{x\to0}\left(\tan\left(5x\right)\right)$
$\left(a^3b^4+\left(-5\right)\right)\left(a^3b^4-\left(-5\right)\right)$
$4m-20am$
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