$-x^2+4x+12$
$4000-130$
$\frac{x^2-9x+20}{x+2}$
$-\left(\left(2+3\right)\times4-\left(6-2\right)\times4\right)$
$\log10\left(x^3-8\right)-\log_{10}\left(x-2\right)$
$30a^2bx-45ab^2y$
$\left(21ab+36\right)\cdot\left(21ab-36\right)$
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