$2055-2622.07143$
$\frac{1}{4}m^2+4$
$x-2y+3y+x$
$-x^3+3x+2$
$\frac{\left(a-x\right)^2-9}{\left(a+x\right)+3}$
$2 ( 3 x ^ { 2 } ) ^ { 3 }$
$\left(k-\:2\right)\left(k+5\right)$
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