$20z^2+4x=0$
$x^2+5x-104$
$-\left(-5xy^3z^2\right)^0$
$\frac{27-x^3}{3+x}$
$12y\:+\:2\:+\:3y\:-\:4y$
$\frac{dy}{dx}=\sqrt{y}-\frac{2y}{x}$
$2a^2-9a-18$
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