$20x^2y-10xy^2$
$\sqrt{\left(a^2+\frac{b}{a}\right)}$
$\lim_{x\to0}\left(\frac{nlog\left(n^2\right)+\left(n-1\right)^2log\left(\frac{n}{2}\right)}{n^2log\left(n\right)}\right)$
$\log\frac{x}{2}=1+\log\left(21-x\right)$
$7x=49$
$1-29$
$350-585$
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