$x^2-14x+49=0$
$\lim_{x\to3}\left(\frac{5}{x-3}-\frac{20}{x^2-x-6}\right)$
$x\left(x-5\right)\ge7+x^2+2x$
$log_b\frac{2}{3}$
$\cos\left(b\right)\cdot\tan\left(b\right)$
$\lim_{x\to2}\left(\frac{sen\left(\sqrt{x}-\sqrt{2}\right)}{\left(x-2\right)\left(x^3+1\right)}\right)$
$\left(5-y\right)\left|5+y\right|$
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