$x^2-23x+120=0$
$\left(3xy+z\right)^2$
$y=3\ln\left(4x\right)$
$x-3x-10$
$x^4-4x^4$
$\lim_{x\to4}\left(\frac{2x^2-7x-4}{x-4}\right)$
$\left(2y^3-\frac{2}{y^3}\right)$
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