$\left(ab-2\right)\left(ab+2\right)$
$\frac{27x^2-4}{3x+7}$
$1-\sqrt{x}\cdot2\sqrt{x}$
$\frac{10}{8-x}+2=\frac{5}{8-x}+3$
$\int xe^{-0.1x}dx$
$4x^2-42x+38=0$
$\left(\sqrt{-3h^2}-15\sqrt{3}\right)^2$
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