$x^2+12x-64=0$
$4a^220ab+25b^2$
$x^2-x-y^2+y^2$
$\left(-1\right)\cdot\left(-5\right)\cdot\left(-4\right)$
$5\sin\left(x\right)+\sqrt{21}=0$
$ln\frac{5y^2}{ez^4}$
$\lim_{x\to1}\left(\frac{2e^x-e}{x^2-1}\right)$
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