$\left(-1\right)^k\left(x+2\right)^{2k+2}$
$\left(\frac{3}{4}-\frac{1}{2}^y^4\right)^4$
$\frac{2x^2}{x^2+4}$
$-23=3u+9-11u$
$x\left(a+b\right)-a-b$
$3 - 2 ( x - 1 ) \leq 2 ( 4 + x )$
$x^6-729y^63$
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