$-\sqrt{18}$
$\frac{\left(5+2i\right)\left(5-2i\right)}{\left(3+i\right)^2}$
$\lim_{x\to0}\left(\frac{\sqrt{x+7}-\sqrt{7}}{x}\right)$
$p\left(12p+3q\right)$
$\frac{x^8}{x^{15}}$
$\frac{1}{x}-\frac{1}{x+1}=3$
$-44\left(6\right)$
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