$\frac{1}{2}\left(a+b\right)$
$\frac{1}{2}x^3+2^3$
$-2x^2+2x+5$
$\frac{x}{x+2}-\frac{3x-6}{x^2-4}$
$\left(3x-2y^2\right)\left(3x+2y^2\right)\left(9x^2+4y^4\right)$
$x-0>-1$
$8r^3-27$
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