$-\sqrt{-\frac{1}{4}}$
$z\:=\:2xy$
$\left(-14\right)-\left(-9\right)$
$-34\cdot12$
$-12x^3+12x^2+144x$
$\frac{x-1}{5}=\frac{x-1}{2}$
$\frac{4a^2}{9}-\frac{25b^2}{4}$
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